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Old 02-25-2012, 04:40 PM   #16
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Improved Air Quality Question/Help


Thanks again. I've got a call into a contractor. Right now what I've been using is the 3M Filtrete 1900 1" which is a 12MERV. I found a Filtrete 2400 but it's a 10MERV. I thought the MERV number determined the size of the particle the filter could capture which also drove the amount of air restriction. Is this true or and I wrong?

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Old 02-25-2012, 06:47 PM   #17
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Google MERV for more info. The higher the merv the smaller the particle it captures but to do that it needs to be finer/denser and that reduces airflow.
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Old 02-26-2012, 09:33 AM   #18
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Do you guys know of a good thermostat that has a cycle setting for just the fan?
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Old 02-26-2012, 09:46 AM   #19
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Honeywell IAQ.
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Old 02-26-2012, 10:07 AM   #20
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Yep. It has a ability to run the fan for 20 mins/hr for circulation which would be a good idea for you. If you get a bypass filter you can have it run all the time even with the furnace fan off and it will help but you still need the fan on for 20 mins to improve the circulation and get a better result. NOT cheap to buy though and quite tricky to install. Need a skilled tech to do it. Probably looking at close to $750 or more to have it installed.

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