{"id":108654,"date":"2022-01-10T14:14:16","date_gmt":"2022-01-10T14:14:16","guid":{"rendered":"https:\/\/www.householdme.com\/?p=108654"},"modified":"2022-04-09T09:57:08","modified_gmt":"2022-04-09T09:57:08","slug":"air-changes-per-hour-calculator","status":"publish","type":"post","link":"https:\/\/www.householdme.com\/air-changes-per-hour-calculator\/","title":{"rendered":"Air Changes per Hour (ACH) Calculator"},"content":{"rendered":"<p>Air changes per hour, denoted as ACH, is a metric that measures how many times an air purifier or HVAC system can replace the air in a room. You will need to use this metric to determine whether or not an air purifier can meet your air-turnover needs.<\/p>\n<p>In today\u2019s guide, we\u2019ll briefly go over how you can calculate the ACH of an HVAC device on your own.<\/p>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Air-Changes-per-Hour-Calculator.jpg\" alt=\"Air Changes per Hour Calculator\" width=\"800\" height=\"500\" class=\"alignnone size-full wp-image-108986\" srcset=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Air-Changes-per-Hour-Calculator.jpg 800w, https:\/\/www.householdme.com\/wp-content\/uploads\/Air-Changes-per-Hour-Calculator-768x480.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<br>\r\n<div class=\"example10\">\r\nThis website is supported by readers. As an Amazon Associate we earn from qualifying purchases.\r\n<\/div>\r\n<br>\n<h2>ACH Calculator and Formula<\/h2>\n<p>Here is a simple calculator you can use to calculate how many ACH your air purifier or HVAC system can provide.<\/p>\n<form name=\"cp_calculatedfieldsf_pform_1\" id=\"cp_calculatedfieldsf_pform_1\" action=\"https:\/\/www.householdme.com\/air-changes-per-hour-calculator\/\" method=\"post\" enctype=\"multipart\/form-data\" onsubmit=\"return fbuilderjQuery.fbuilder.doValidate(this);\" class=\"cff-form \" >\n<input type=\"hidden\" name=\"cp_calculatedfieldsf_pform_psequence\" value=\"_1\" \/>\n<input type=\"hidden\" name=\"cp_calculatedfieldsf_id\" value=\"16\" \/>\n<input type=\"hidden\" name=\"cp_ref_page\" value=\"https:\/\/www.householdme.com\" \/>\n<pre style=\"display:none !important;\"><script type=\"text\/javascript\">form_structure_1=[[{\"form_identifier\":\"\",\"name\":\"fieldname2\",\"shortlabel\":\"\",\"index\":0,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Room Length (ft)\",\"predefined\":\"\",\"predefinedClick\":false,\"required\":true,\"exclude\":false,\"readonly\":false,\"numberpad\":true,\"size\":\"small\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"formatDynamically\":false,\"dformat\":\"digits\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname3\",\"shortlabel\":\"\",\"index\":1,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Room Width (ft)\",\"predefined\":\"\",\"predefinedClick\":false,\"required\":true,\"exclude\":false,\"readonly\":false,\"numberpad\":true,\"size\":\"small\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"formatDynamically\":false,\"dformat\":\"digits\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname5\",\"shortlabel\":\"\",\"index\":2,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Room Height (ft)\",\"predefined\":\"\",\"predefinedClick\":false,\"required\":true,\"exclude\":false,\"readonly\":false,\"numberpad\":true,\"size\":\"small\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"formatDynamically\":false,\"dformat\":\"digits\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"form_identifier\":\"\",\"name\":\"fieldname6\",\"shortlabel\":\"\",\"index\":3,\"ftype\":\"fnumber\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Identify the CADR\",\"predefined\":\"\",\"predefinedClick\":false,\"required\":true,\"exclude\":false,\"readonly\":false,\"numberpad\":true,\"size\":\"small\",\"thousandSeparator\":\"\",\"decimalSymbol\":\".\",\"min\":\"\",\"max\":\"\",\"formatDynamically\":false,\"dformat\":\"digits\",\"formats\":[\"digits\",\"number\",\"percent\"],\"fBuild\":{},\"parent\":\"\"},{\"dependencies\":[{\"rule\":\"\",\"complex\":false,\"fields\":[\"\"]}],\"form_identifier\":\"\",\"name\":\"fieldname7\",\"shortlabel\":\"\",\"index\":4,\"ftype\":\"fCalculated\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Cubic Feet per Hour (CFH)\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"small\",\"eq\":\"SUM(fieldname6*60)\",\"min\":\"\",\"max\":\"\",\"suffix\":\"\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"hidefield\":false,\"fBuild\":{},\"parent\":\"\"},{\"dependencies\":[{\"rule\":\"\",\"complex\":false,\"fields\":[\"\"]}],\"form_identifier\":\"\",\"name\":\"fieldname1\",\"shortlabel\":\"\",\"index\":5,\"ftype\":\"fCalculated\",\"userhelp\":\"\",\"userhelpTooltip\":false,\"tooltipIcon\":false,\"csslayout\":\"\",\"title\":\"Air Changes per Hour Value (ACH)\",\"predefined\":\"\",\"required\":false,\"exclude\":false,\"size\":\"small\",\"eq\":\"SUM(fieldname7\\\/(fieldname2*fieldname3*fieldname5))\",\"min\":\"\",\"max\":\"\",\"suffix\":\"\",\"prefix\":\"\",\"decimalsymbol\":\".\",\"groupingsymbol\":\"\",\"readonly\":true,\"currency\":false,\"noEvalIfManual\":true,\"formatDynamically\":false,\"hidefield\":false,\"fBuild\":{},\"parent\":\"\"}],{\"0\":{\"title\":\"\",\"description\":\"\",\"formlayout\":\"top_aligned\",\"formtemplate\":\"cp_cff_13\",\"evalequations\":1,\"evalequationsevent\":2,\"loading_animation\":0,\"autocomplete\":1,\"persistence\":0,\"customstyles\":\"\"},\"formid\":\"cp_calculatedfieldsf_pform_1\"}];<\/script><\/pre>\n<div id=\"fbuilder\">\n\t\t<div id=\"fbuilder_1\">\n\t\t<div id=\"formheader_1\"><\/div>\n\t\t<div id=\"fieldlist_1\"><\/div>\n\t\t<div class=\"clearer\"><\/div>\n\t<\/div>\n<\/div>\n\t<div id=\"cp_subbtn_1\" class=\"cp_subbtn\" style=\"display:none;\"><\/div><div class=\"clearer\"><\/div>\n\t<input type=\"hidden\" id=\"_cpcff_public_nonce\" name=\"_cpcff_public_nonce\" value=\"f96d1ed777\" \/><input type=\"hidden\" name=\"_wp_http_referer\" value=\"\/wp-json\/wp\/v2\/posts\/108654\" \/><\/form>\n\t\n<p><\/p>\n<p>Alternatively, you can attempt to calculate ACH manually. Here\u2019s how you do it.<br \/>\nACH = (CADR \u00d7 60) \u00f7 (Room Size \u00d7 Room Height)<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>ACH = Air Changes per Hour<\/li>\n<li>CADR = Clean Air Delivery Rate, aka Cubic Feet per Minute (CFM)<\/li>\n<li>Room Size = Room Length \u00d7 Room Width<\/li>\n<li>Room Height = The height between the room\u2019s floor and ceiling<\/li>\n<\/ul>\n<p>In the first half of the equation, we convert CADR, or the air purifier\u2019s cubic feet per minute output, into hours by multiplying it by 60 minutes. The second half of the formula calculates the volume of a room where your will plant your air purifier\/HVAC device.<\/p>\n<p>Dividing the hourly cleaning output of the air purifier\/HVAC device over the total volume of an enclosed room gives us a final ACH count, which we can use to determine whether or not the device in question is suitable for the room.<\/p>\n<p>It\u2019s also worth noting how many ACH you will need based on room types. The following chart will assist you in finding the right air-purifying device for a specific room at home or business.<\/p>\n<p><strong>Home<\/strong><\/p>\n<ul>\n<li>Basements \u2013 3-4 ACH<\/li>\n<li>Bedrooms \u2013 5-6 ACH<\/li>\n<li>Bathrooms \u2013 6-7 ACH<\/li>\n<li>Living Rooms \u2013 6-8 ACH<\/li>\n<li>Kitchens \u2013 7-8 ACH<\/li>\n<li>Laundry Room \u2013 8-9 ACH<\/li>\n<\/ul>\n<p><strong>Business<\/strong><\/p>\n<ul>\n<li>Offices \u2013 6-8 ACH<\/li>\n<li>Cafeteria\/Break Rooms \u2013 7-8 ACH<\/li>\n<li>Meeting Rooms \u2013 8-12 ACH<\/li>\n<li>Smoking Area \u2013 13-15 ACH<\/li>\n<\/ul>\n<p><strong>Restaurants<\/strong><\/p>\n<ul>\n<li>Dining Area (Non-Smoking) \u2013 8-10 ACH<\/li>\n<li>Dining Area (Smoking) \u2013 15-18 ACH<\/li>\n<li>Kitchens \u2013 14-18 ACH<\/li>\n<\/ul>\n<p><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/ACH-formula.jpg\" alt=\"ACH formula\" width=\"800\" height=\"500\" class=\"alignnone size-full wp-image-108988\" srcset=\"https:\/\/www.householdme.com\/wp-content\/uploads\/ACH-formula.jpg 800w, https:\/\/www.householdme.com\/wp-content\/uploads\/ACH-formula-768x480.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<div class=\"example40\">\n<fieldset>\n<legend><strong><span class=\"green_bg\">Did you Know<\/span><\/strong><\/legend>\n<p>In restaurants that allow smoking, cigarette smoke <a href=\"https:\/\/www.tandfonline.com\/doi\/abs\/10.1080\/15459620701204801?journalCode=uoeh20\" rel=\"noopener\" target=\"_blank\">may be present<\/a> in all areas of the restaurant, even if it the restaurant has a designated smoking section<br \/>\n<\/fieldset>\n<\/div>\n<p><\/br><\/p>\n<p>Let\u2019s say you are in search of an air purifier for your bedroom. The bedroom measures 10 \u00d7 10 in size and has 8-foot-tall ceilings. The air purifier you\u2019re looking at has a CADR of 150 in all three categories (dust, smoke, pollen).<br \/>\nIf we input these variables into the ACH formula, we should get:<\/p>\n<ul>\n<li>ACH = (CADR \u00d7 60) \u00f7 (Room Size \u00d7 Room Height)<\/li>\n<li>ACH = (150 \u00d7 60) \u00f7 (100 \u00d7 8)<\/li>\n<li>ACH = 9,000 \u00f7 800<\/li>\n<li>ACH = 11.25<\/li>\n<\/ul>\n<p>The air purifier you\u2019re considering has a maximum ACH output of 11.25 in your 10 \u00d7 10 \u00d7 8-foot bedroom, which is more than twice the necessary minimum ACH requirement for a bedroom.<br \/>\nAlternatively, if you want to calculate the minimum CADR to determine whether or not it will fit your desired ACH level, you can use the following formula:<\/p>\n<p><strong>CADR = (ACH \u00d7 (Room Size \u00d7 Room Height)) \u00f7 60 <\/strong><\/p>\n<p>Assuming you want to purchase an air purifier that can produce at least 5 ACH in a 10 \u00d7 10-foot room with an 8-foot-tall ceiling, the calculation would be as follows:<\/p>\n<ul>\n<li>CADR = (ACH \u00d7 (Room Size \u00d7 Room Height)) \u00f7 60<\/li>\n<li>CADR = (5 \u00d7 (100 \u00d7 8)) \u00f7 60<\/li>\n<li>CADR = 4,000 \u00f7 60<\/li>\n<li>CADR = 66.667<\/li>\n<\/ul>\n<p>So, an air purifier\/HVAC device that produces a minimum CADR of 66.667 CFM would be suitable enough to clean the air in your 10 \u00d7 10 \u00d7 8-foot bedroom.<\/p>\n<figure id=\"attachment_107065\" aria-describedby=\"caption-attachment-107065\" style=\"width: 990px\" class=\"wp-caption alignnone\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Levoit-Core-400S-Smart-True-HEPA-Air-Purifier-1.jpg\" alt=\"Levoit Core 400S\" width=\"1000\" height=\"540\" class=\"size-full wp-image-107065\" srcset=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Levoit-Core-400S-Smart-True-HEPA-Air-Purifier-1.jpg 1000w, https:\/\/www.householdme.com\/wp-content\/uploads\/Levoit-Core-400S-Smart-True-HEPA-Air-Purifier-1-768x415.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-107065\" class=\"wp-caption-text\"><a href=\"https:\/\/www.householdme.com\/levoit-vesync-core400s-smart-true-hepa-air-purifier-review\/\">Levoit Core 400S<\/a><\/figcaption><\/figure>\n<h2>Choosing the Right Air Purifier<\/h2>\n<p>Now that we know what ACH is and how to calculate it. But should you just calculate how many times an air purifier can clean the air in a room, or is there more to it?<\/p>\n<h3>How to Find the ACH of an Air Purifier?<\/h3>\n<ol>\n<li><strong>Calculate The Room Size:<\/strong> Length x Width x Height = Room Size<\/li>\n<li><strong>Identify The Purifier&#8217;s CADR:<\/strong> The CADR, or Clean Air Delivery Rate, is provided by the manufacturer. Look for the tobacco smoke CADR.<\/li>\n<li><strong>Convert The Cadr To Cubic Feet Per Hour:<\/strong> If the CADR is provided in cubic feet per minute (cfm), multiply the number by 60 for cubic feet per hour (cfh).<\/li>\n<li><strong>Calculate The Air Changes Per Hour:<\/strong> Divide the CADR amount (in cfh) by the room size to find the air changes per hour (ACH). The ideal ACH is 5 or higher.<\/li>\n<\/ol>\n<p><strong>There\u2019s more to an air purifier.<\/strong><\/p>\n<figure id=\"attachment_99801\" aria-describedby=\"caption-attachment-99801\" style=\"width: 990px\" class=\"wp-caption alignnone\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/2021\/06\/Coway-Airmega-400-Smart-Air-Purifier.jpg\" alt=\"Coway Airmega 400\" width=\"1000\" height=\"562\" class=\"size-full wp-image-99801\" srcset=\"https:\/\/www.householdme.com\/wp-content\/uploads\/2021\/06\/Coway-Airmega-400-Smart-Air-Purifier.jpg 1000w, https:\/\/www.householdme.com\/wp-content\/uploads\/2021\/06\/Coway-Airmega-400-Smart-Air-Purifier-768x432.jpg 768w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption id=\"caption-attachment-99801\" class=\"wp-caption-text\"><a href=\"https:\/\/www.householdme.com\/best-coway-air-purifiers\/\">Coway Air Purifier<\/a><\/figcaption><\/figure>\n<p>When shopping for an air purifier or a type of HVAC device, you should keep your eyes peeled for the following:<\/p>\n<ul>\n<li><strong>CADR:<\/strong> This metric measures the device\u2019s cleaning efficiency. The higher the CADR rating, the more air changes it can pack per hour.<\/li>\n<li><strong>Filtration States:<\/strong> How many filters does the air purifier come with? Standard air purifiers usually have two or three stages, but some of the top-tier models have four stages and beyond.<\/li>\n<li><strong>Coverage Capacity:<\/strong> Just because an air purifier can theoretically produce 5 ACH in a room doesn\u2019t mean it\u2019s equipped to handle it. So, pay close attention to an air purifier as its coverage capacity (expressed in square feet) will give you an idea of what type of room it belongs in.<\/li>\n<li><strong>Air-Quality Sensors:<\/strong> Some air purifiers come with highly sensitive sensors that can calculate how polluted the air in a room is. If pollution concentrations exceed a certain threshold, the air purifier will kick it into high gear without human intervention.<\/li>\n<\/ul>\n<\/br>\r\n\r\n<img src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Air-Recommended-Air-Purifiers.jpg\" alt=\"Air Recommended Air Purifiers\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-112612\" \/>\r\n\r\n<\/br>\r\n<\/br>\r\n\r\n<div class=\"example10\"><fieldset><legend><strong><span class=\"blue_bg\">Our Pick<\/span><\/strong><\/legend>\r\n<img class=\"size-full wp-image-5348 alignleft\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Coway-Airmega-AP-1512HH.jpg\" alt=\"\" width=\"175\" height=\"175\" \/>\r\n\r\nPerfect for bedrooms, playrooms, and living rooms, the <strong><a href=\"https:\/\/amzn.to\/3rZmBRq\" rel=\"noopener\" target=\"_blank\"><u>Coway Airmega AP-1512HH<\/u><\/a><\/strong> is one of the best-performing, most durable, and most economical purifiers we\u2019ve tested.\r\n<\/fieldset>\r\n<\/div>\r\n\r\n<\/br>\r\n\r\n<div class=\"example10\"><fieldset><legend><strong><span class=\"green_bg\">Most Popular<\/span><\/strong><\/legend>\r\n<img class=\"size-full wp-image-5348 alignleft\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/LEVOIT-Core-300.jpg\" alt=\"\" width=\"175\" height=\"175\" \/>\r\n\r\nThe <strong><a href=\"https:\/\/amzn.to\/3sNQDXO\" rel=\"noopener\" target=\"_blank\"><u>Levoit Core 300<\/u><\/a><\/strong> air purifier has some strong suits, but in our opinion it falls short of carving out a meaningful niche for itself. Its ideal use would be in a small bedroom occupied by someone who is sensitive to noise.\r\n<\/fieldset>\r\n<\/div>\r\n\r\n<\/br>\r\n\r\n<div class=\"example10\"><fieldset><legend><strong><span class=\"red_bg\">Also Great<\/span><\/strong><\/legend>\r\n<img class=\"size-full wp-image-5348 alignleft\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Winix-5500-2.jpg\" alt=\"\" width=\"175\" height=\"175\" \/>\r\n\r\nWith high end air cleaning performance and a whisper quiet fan, the <strong><a href=\"https:\/\/amzn.to\/3gZuK2e\" rel=\"noopener\" target=\"_blank\"><u>Winix 5500-2<\/u><\/a><\/strong> is the perfect combination of power and finesse. It cleared airborne particulates out of our smokey testing room faster than any other model.\r\n<\/fieldset>\r\n<\/div>\r\n\r\n<\/br>\r\n\r\n<div class=\"example10\"><fieldset><legend><strong><span class=\"blue_bg\">Best of the Best<\/span><\/strong><\/legend>\r\n<img class=\"size-full wp-image-5348 alignleft\" src=\"https:\/\/www.householdme.com\/wp-content\/uploads\/Coway-Airmega-400S.jpg\" alt=\"\" width=\"175\" height=\"175\" \/>\r\n\r\nIf you have a large space you want to remove irritants from, We recommend the <strong>Airmega 400S<\/strong>. All of Coway air purifiers do an excellent job of attacking indoor pollutants, and we highly recommend any of them. The 400S is designed to accommodate large room sizes.\r\n<p style=\"text-align: right;\"><a class=\"button sun\" href=\"https:\/\/amzn.to\/3rWsYoF\" target=\"_blank\" rel=\"noopener\">Check Latest Price ><\/a><\/p>\r\n<\/fieldset>\r\n<\/div>\r\n\r\n<\/br>\n<br>\r\nIf you have any questions or comments, please add them below in the comment section. Similarly, please let us know if you spot any mistakes or omissions. <strong>Thanks<\/strong>!\r\n<br>\r\n<br>\r\n<br>\r\n\r\n<center>\r\n\r\n<div id=\"mc_embed_shell\">\r\n      <link href=\"\/\/cdn-images.mailchimp.com\/embedcode\/classic-061523.css\" rel=\"stylesheet\" type=\"text\/css\">\r\n  <style type=\"text\/css\">\r\n        #mc_embed_signup{background:#fff; false;clear:left; font:14px Helvetica,Arial,sans-serif; width: 350px;}\r\n        \/* Add your own Mailchimp form style overrides in your site stylesheet or in this style block.\r\n           We recommend moving this block and the preceding CSS link to the HEAD of your HTML file. *\/\r\n<\/style>\r\n<div id=\"mc_embed_signup\">\r\n    <form action=\"https:\/\/gmail.us21.list-manage.com\/subscribe\/post?u=8d3944c8f0a6c138dd2110dc5&amp;id=a2857ab900&amp;f_id=002f5fe1f0\" method=\"post\" id=\"mc-embedded-subscribe-form\" name=\"mc-embedded-subscribe-form\" class=\"validate\" target=\"_blank\">\r\n        <div id=\"mc_embed_signup_scroll\"><h2>Subscribe to <strong><a href=\"https:\/\/www.brasq.com\/\" rel=\"noopener\" target=\"_blank\"><u>Brasq Deals<\/u><\/a><\/strong><\/h2>\r\n            <div class=\"indicates-required\"><span class=\"asterisk\">*<\/span> indicates required<\/div>\r\n            <div class=\"mc-field-group\"><label for=\"mce-EMAIL\">Email Address <span class=\"asterisk\">*<\/span><\/label><input type=\"email\" name=\"EMAIL\" class=\"required email\" id=\"mce-EMAIL\" required=\"\" value=\"\"><\/div>\r\n        <div id=\"mce-responses\" class=\"clear foot\">\r\n            <div class=\"response\" id=\"mce-error-response\" style=\"display: none;\"><\/div>\r\n            <div class=\"response\" id=\"mce-success-response\" style=\"display: none;\"><\/div>\r\n        <\/div>\r\n    <div aria-hidden=\"true\" style=\"position: absolute; left: -5000px;\">\r\n        \/* real people should not fill this in and expect good things - do not remove this or risk form bot signups *\/\r\n        <input type=\"text\" name=\"b_8d3944c8f0a6c138dd2110dc5_a2857ab900\" tabindex=\"-1\" value=\"\">\r\n    <\/div>\r\n        <div class=\"optionalParent\">\r\n            <div class=\"clear foot\">\r\n                <input type=\"submit\" name=\"subscribe\" id=\"mc-embedded-subscribe\" class=\"button\" value=\"Subscribe\">\r\n            <\/div>\r\n        <\/div>\r\n    <\/div>\r\n<\/form>\r\n<\/div>\r\n<script type=\"text\/javascript\" src=\"\/\/s3.amazonaws.com\/downloads.mailchimp.com\/js\/mc-validate.js\"><\/script><script type=\"text\/javascript\">(function($) {window.fnames = new Array(); window.ftypes = new Array();fnames[0]=EMAIL;ftypes[0]=merge;,fnames[4]=PHONE;ftypes[4]=merge;false}(jQuery));var $mcj = jQuery.noConflict(true);<\/script><\/div>\r\n\r\n\r\n<\/center>\n","protected":false},"excerpt":{"rendered":"<p>Air changes per hour, denoted as ACH, is a metric that measures how many times an air purifier or HVAC &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Air Changes per Hour (ACH) Calculator\" class=\"read-more button\" href=\"https:\/\/www.householdme.com\/air-changes-per-hour-calculator\/#more-108654\" aria-label=\"Read more about Air Changes per Hour (ACH) Calculator\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":108986,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[89,90,17195,17196],"tags":[],"_links":{"self":[{"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/posts\/108654"}],"collection":[{"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/comments?post=108654"}],"version-history":[{"count":8,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/posts\/108654\/revisions"}],"predecessor-version":[{"id":112620,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/posts\/108654\/revisions\/112620"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/media\/108986"}],"wp:attachment":[{"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/media?parent=108654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/categories?post=108654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.householdme.com\/wp-json\/wp\/v2\/tags?post=108654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}