{"id":4758,"date":"2020-04-09T16:06:23","date_gmt":"2020-04-09T16:06:23","guid":{"rendered":"http:\/\/blog.infraspeak.com\/?p=4758"},"modified":"2023-03-27T16:11:02","modified_gmt":"2023-03-27T16:11:02","slug":"como-operar-sistemas-tecnicos-de-edificios-para-prevenir-a-propagacao-da-covid-19","status":"publish","type":"post","link":"https:\/\/blog.infraspeak.com\/pt-br\/como-operar-sistemas-tecnicos-de-edificios-para-prevenir-a-propagacao-da-covid-19\/","title":{"rendered":"Como operar sistemas t\u00e9cnicos de edif\u00edcios para prevenir a propaga\u00e7\u00e3o da COVID-19"},"content":{"rendered":"<div id=\"bsf_rt_marker\"><\/div><p><span style=\"font-weight: 400;\">A comunidade cient\u00edfica ainda sabe pouco, muito pouco, sobre a COVID-19. Mas, com base no que j\u00e1 sabemos, tanto a <\/span><a href=\"https:\/\/www.who.int\/docs\/default-source\/coronaviruse\/getting-workplace-ready-for-covid-19.pdf?sfvrsn=359a81e7_6\"><span style=\"font-weight: 400;\">Organiza\u00e7\u00e3o Mundial da Sa\u00fade<\/span><\/a><span style=\"font-weight: 400;\"> como a <\/span><a href=\"http:\/\/www.confea.org.br\/\"><span style=\"font-weight: 400;\">Confedera\u00e7\u00e3o Federal de Engenharia e Agronomia (CONFEA)<\/span><\/a><span style=\"font-weight: 400;\"> recomendam uma s\u00e9rie de medidas para prevenir a propaga\u00e7\u00e3o da COVID-19 em edif\u00edcios. Al\u00e9m do distanciamento social e de outras <\/span><a href=\"https:\/\/blog.infraspeak.com\/pt-br\/covid-19-gestao-de-facilities\/\"><span style=\"font-weight: 400;\">medidas de preven\u00e7\u00e3o em gest\u00e3o de facilities<\/span><\/a>,<span style=\"font-weight: 400;\">\u00a0os gestores de manuten\u00e7\u00e3o devem ter cuidados redobrados com os sistemas AVAC (aquecimento, ventila\u00e7\u00e3o e ar-condicionado) e distribui\u00e7\u00e3o de \u00e1guas. <\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Todas as medidas de que vamos falar para gestores de facilities, baseadas nas <a href=\"https:\/\/www.rehva.eu\/fileadmin\/user_upload\/orientacoes_rehva_covid19.pdf\">orienta\u00e7\u00f5es da Ordem dos Engenheiros de Portugal<\/a> s\u00e3o v\u00e1lidas para edif\u00edcios residenciais e n\u00e3o-residenciais onde se concentram grandes n\u00fameros de pessoas, como escrit\u00f3rios, hot\u00e9is, escolas ou centros comerciais. Os hospitais, centros de sa\u00fade, cl\u00ednicas e outros locais de atividades cl\u00ednicas devem seguir sempre as orienta\u00e7\u00f5es e normas mais recentes do Minist\u00e9rio da Sa\u00fade.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2>\u00c9 poss\u00edvel o Coronav\u00edrus se propagar em edif\u00edcios?<\/h2>\n<p>Resposta curta e direta: sim. At\u00e9 agora [9 de abril de 2020, data de cria\u00e7\u00e3o deste guia], conhecemos pelo menos tr\u00eas formas de cont\u00e1gio do SARS-CoV-2, v\u00edrus que causa a COVID-19:<\/p>\n<p>&#8211; Contato direto com um infectado ou, mesmo, uma superf\u00edcie com o v\u00edrus se, depois, a pessoa colocar a m\u00e3o em contato com uma mucosa (boca\/ nariz\/ olhos);<\/p>\n<p>&nbsp;<\/p>\n<p>&#8211; Inspira\u00e7\u00e3o de got\u00edculas virais, que os infectados expelem quando falam, tossem ou espirram (que podem ficar at\u00e9 3 horas no ar e serem projetadas por v\u00e1rios metros);<\/p>\n<p>&nbsp;<\/p>\n<p>&#8211; Contamina\u00e7\u00e3o oral-fecal (reconhecida em mar\u00e7o, uma vez que o v\u00edrus \u00e9 excretado nas fezes).<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">\u00c9 nestas duas \u00faltimas formas de cont\u00e1gio que os gestores de facilities precisam focar. Sabemos que o Coronav\u00edrus foi detectado nos dutos de exaust\u00e3o de enfermarias e locais destinados a tratar pacientes com a doen\u00e7a. Isto reafirma a hip\u00f3tese de que as part\u00edculas se projetam muito mais do que 1 ou 2 metros em locais fechados e nos obriga a reavaliar a melhor forma de ventilar estes espa\u00e7os.\u00a0\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Por outro lado, as part\u00edculas que entram no sistema de distribui\u00e7\u00e3o de \u00e1guas foram uma via de transmiss\u00e3o ativa do SARS-CoV-1, o respons\u00e1vel pelo surto de SARS entre 2002 e 2003 na \u00c1sia. As transmiss\u00f5es de SARS atrav\u00e9s dos dutos aconteceram em Hong Kong, onde <\/span><a href=\"https:\/\/apps.who.int\/iris\/bitstream\/handle\/10665\/207501\/9290612134_eng.pdf\"><span style=\"font-weight: 400;\">107 pessoas<\/span><\/a><span style=\"font-weight: 400;\"> que viviam no mesmo bloco de apartamentos ficaram infectadas com a doen\u00e7a. Por isso, e ainda sem certezas sobre a transmiss\u00e3o a\u00e9rea de part\u00edculas do novo Coronav\u00edrus, as normas pedem uma abordagem ALARA (\u201cas low as reasonably possible\u201d) ao risco \u2013 ou, em bom portugu\u00eas, a velha m\u00e1xima \u201c\u00e9 melhor prevenir do que remediar\u201d.\u00a0\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-weight: 400;\">Medidas de gest\u00e3o de manuten\u00e7\u00e3o para prevenir a propaga\u00e7\u00e3o de COVID-19 em edif\u00edcios e locais de trabalho<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Com base no que sabemos at\u00e9 agora, estas s\u00e3o as pr\u00e1ticas que os gestores de manuten\u00e7\u00e3o devem adotar para prevenir a propaga\u00e7\u00e3o de COVID-19 em edif\u00edcios atrav\u00e9s de sistemas AVAC. \u00c0 medida que surjam novos estudos e informa\u00e7\u00f5es sobre o novo Coronav\u00edrus e o comportamento do SARS-CoV-2, a expectativa \u00e9 que as instru\u00e7\u00f5es do CONFEA, <a href=\"https:\/\/www.rehva.eu\/activities\/covid-19-guidance\">da REHVA<\/a> e, mesmo, do Minist\u00e9rio da Sa\u00fade sejam revistas e melhoradas.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"font-weight: 400;\">Ventila\u00e7\u00e3o e extra\u00e7\u00e3o do ar durante a epidemia de COVID-19<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">A melhor forma de garantir que as part\u00edculas virais n\u00e3o fiquem pairando nos espa\u00e7os comuns de pr\u00e9dios, \u00e9 aumentar a ventila\u00e7\u00e3o e extrair o ar:<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Ligar a ventila\u00e7\u00e3o 24\/7<\/b><span style=\"font-weight: 400;\">, ainda que seja em baixa pot\u00eancia;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&#8211; Se poss\u00edvel, para evitar contamina\u00e7\u00e3o oral-fecal, <strong>ventilar as instala\u00e7\u00f5es sanit\u00e1rias com press\u00e3o negativa<\/strong>;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>&#8211; Abrir as janelas com mais frequ\u00eancia<\/strong>, mesmo que isso comprometa um pouco a temperatura ideal do ambiente, especialmente em salas que foram usadas previamente por outras pessoas;<\/p>\n<p>&nbsp;<\/p>\n<p>&#8211; No caso de um espa\u00e7o ter sido usado por algu\u00e9m com suspeita ou diagn\u00f3stico confirmado de Coronav\u00edrus, o local deve ser <strong>arejado naturalmente por, pelo menos, 3 horas<\/strong>.<\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"font-weight: 400;\">Recircula\u00e7\u00e3o do ar em sistemas AVAC &amp; Aquecimento<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Como as part\u00edculas do v\u00edrus podem permanecer nos dutos de exaust\u00e3o, \u00e9 essencial evitar a recircula\u00e7\u00e3o de ar em sistemas AVAC para prevenir o Coronav\u00edrus:\u00a0<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">&#8211; Nas Unidades de Tratamento de Ar que aproveitam o ar e o recirculam, <\/span><b>as se\u00e7\u00f5es de mistura devem ser fechadas mesmo que tenham filtros<\/b><span style=\"font-weight: 400;\"> (pois n\u00e3o s\u00e3o filtros HEPA e, dessa forma, deixam passar micropart\u00edculas de SARS-CoV-2);<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Os ventiloconvectores devem ser desligados<\/b>. Caso n\u00e3o seja poss\u00edvel, devem ser desinfectados com cuidado redobrado;<\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Os permutadores de calor e recuperadores de calor devem ser desligados<\/b>, com exce\u00e7\u00e3o dos sistemas que conseguem fazer a separa\u00e7\u00e3o total do ar de admiss\u00e3o e do ar de retorno;<\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Os purificadores de ar s\u00f3 funcionam em locais muito pequenos<\/b> (&lt;10 m\u00b2) por isso, s\u00f3 t\u00eam benef\u00edcios se forem instalados muito perto das pessoas \u2013 no geral, a ventila\u00e7\u00e3o adequada dos espa\u00e7os oferece muito mais vantagens;<\/p>\n<p>&nbsp;<\/p>\n<p>&#8211; <a href=\"https:\/\/www.ecdc.europa.eu\/sites\/default\/files\/documents\/Environmental-persistence-of-SARS_CoV_2-virus-Options-for-cleaning2020-03-26_0.pdf\"><b>Filtros HEPA<\/b><\/a><b> devem ser instalados em salas sem janelas e em circuitos fechados<\/b>. Estes s\u00e3o os \u00fanicos capazes de filtrar as micropart\u00edculas de v\u00edrus.<\/p>\n<p>&nbsp;<\/p>\n<table style=\"background-color: #f2f7fc; padding: 40px;\">\n<tbody>\n<tr>\n<td>\n<h2><span style=\"font-weight: 400;\">Devo alterar o plano de manuten\u00e7\u00e3o por causa da COVID-19?<\/span><\/h2>\n<p>&nbsp;<\/p>\n<p><b>&#8211; N\u00e3o h\u00e1 nenhuma vantagem em fazer limpeza adicional de dutos,<\/b><span style=\"font-weight: 400;\"> desde que possa se evitar 100% a recircula\u00e7\u00e3o de ar e os espa\u00e7os sejam ventilados. Fa\u00e7a a limpeza e higieniza\u00e7\u00e3o dos dutos de acordo com o planejado.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Substitua os filtros apenas quando ultrapassar o seu tempo de utiliza\u00e7\u00e3o ou houver uma quebra na carga introduzida.<\/b><span style=\"font-weight: 400;\"> Se n\u00e3o h\u00e1 nenhum problema no seu desempenho, n\u00e3o h\u00e1 vantagens em trocar com mais frequ\u00eancia.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; N\u00e3o h\u00e1 necessidade de alterar os filtros exteriores<\/b><span style=\"font-weight: 400;\">, j\u00e1 que os sistemas de ventila\u00e7\u00e3o atuais t\u00eam filtros F7, F8 ou ISO ePM1. Na d\u00favida, veja os detalhes t\u00e9cnicos do equipamento para confirmar.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>\u00a0&#8211; Os t\u00e9cnicos de manuten\u00e7\u00e3o devem usar m\u00e1scara, viseiras e luvas para substituir os filtros<\/b><span style=\"font-weight: 400;\">, pois eles podem ser um reservat\u00f3rio do v\u00edrus. \u00c9 importante assumir sempre, mesmo em situa\u00e7\u00f5es normais de sa\u00fade p\u00fablica, que os filtros t\u00eam material microbiol\u00f3gico potencialmente contagioso.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Os filtros devem ser depositados em sacos lacrados<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>\u00a0&#8211; A desinfec\u00e7\u00e3o por ioniza\u00e7\u00e3o ou raios UV n\u00e3o \u00e9 recomendada<\/b><span style=\"font-weight: 400;\"> para edif\u00edcios comuns e s\u00f3 faz sentido em contexto hospitalar.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3><b>\u00a0<\/b><\/h3>\n<h3><span style=\"font-weight: 400;\">Distribui\u00e7\u00e3o de \u00e1guas e cont\u00e1gio de COVID-19 atrav\u00e9s da canaliza\u00e7\u00e3o<\/span><b><\/b><\/h3>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Os problemas no sistema de distribui\u00e7\u00e3o de \u00e1guas e nos dutos aumentam as possibilidades de cont\u00e1gio fecal-oral. Por isso, \u00e9 fundamental prestar aten\u00e7\u00e3o em duas coisas:<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Acionar a descarga sempre com a tampa do sanit\u00e1rio fechada,<\/b><span style=\"font-weight: 400;\"> para evitar a propaga\u00e7\u00e3o de part\u00edculas;<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><b>&#8211; Evitar que os sif\u00f5es e o compartimento de \u00e1gua do sanit\u00e1rio fiquem vazios. Manter o n\u00edvel de \u00e1gua dentro do recomendado<\/b><span style=\"font-weight: 400;\"> impede que as descargas e part\u00edculas de v\u00edrus voltem a <\/span><a href=\"https:\/\/edition.cnn.com\/2020\/02\/12\/asia\/hong-kong-coronavirus-pipes-intl-hnk\/index.html\"><span style=\"font-weight: 400;\">entrar no ambiente<\/span><\/a><span style=\"font-weight: 400;\"> \u2013 para isso, use todos os pontos de \u00e1gua a cada tr\u00eas semanas.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h3><span style=\"font-weight: 400;\">Regula\u00e7\u00e3o da umidade e da temperatura para prevenir a COVID-19<\/span><\/h3>\n<p>&nbsp;<\/p>\n<p><span style=\"font-weight: 400;\">Embora alguns v\u00edrus sejam altamente sens\u00edveis a mudan\u00e7as nos n\u00edveis de umidade e de temperatura, o novo coronav\u00edrus \u00e9 especialmente resistente. O SARS-CoV-2 s\u00f3 \u00e9 sens\u00edvel a umidade acima de 80% e a temperaturas acima dos 30\u00baC que, como \u00e9 poss\u00edvel imaginar, n\u00e3o s\u00e3o condi\u00e7\u00f5es vi\u00e1veis para edif\u00edcios de escrit\u00f3rios, muito menos em locais que prestam cuidados a pacientes. Dessa forma, n\u00e3o vale a pena fazer ajustes da umidade e da temperatura do ar-condicionado para prevenir a COVID-19.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um conjunto de recomenda\u00e7\u00f5es em rela\u00e7\u00e3o aos sistemas de AVAC para prevenir a propaga\u00e7\u00e3o da COVID-19 em edif\u00edcios e locais de trabalho.\u00a0<\/p>\n","protected":false},"author":54,"featured_media":4691,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":"","_wp_rev_ctl_limit":""},"categories":[366],"tags":[859,594,595,547,858],"class_list":["post-4758","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manutencao","tag-contagio-pt-br","tag-covid-10","tag-edidicios","tag-gestao-de-facilities","tag-manutencao-pt-br"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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