Replies

1. 
   finePNW | Oct 24, 2023 08:14pm | #1

   4”+ thickness with standard size (eg 20x20”). Something from Columbia or April Aire perhaps? You want a low pressure drop and, perhaps counterintuitively, thicker filters can give you this due to their pleated shape and increased surface area.

   Edit: I assume you are willing to adapt the box to the size of your ERV intake pipe. But just in case, can you specify the size ducting into which you’re hoping to integrate the filter media box? As an aside, I have a filter box on my HRV intake just before the core and also on my central air handler on the return just before the handler.

2. 
   kyle_r | Oct 24, 2023 09:01pm | #2

   I have seen others recommend these.

   https://www.hvacquick.com/products/residential/Indoor-Air-Quality/Inline-Filter-Boxes/HVACQuick-CFB-Series-MERV-13-Inline-Filter-Boxes

3. 
   Shawnnixon1 | Oct 27, 2023 09:46pm | #3

   Mine is 6” duct sizing, please let me know I’m in Canada

4. 
   nrosdal | Nov 03, 2023 11:30pm | #4

   i have been looking at similar options but the issue i am having when i think it through is that in the winter it will be very cold air coming in. So the filter box will need to be lined either inside or out to prevent condensation.

5. Expert Member
   Akos | Nov 05, 2023 08:54am | #5

   I would get a filter box that is rectangular so it can be easily wrapped in rigid insulation. You can look at AirScape SFB or the AC infinity ones. I use a Fantech FB6 wrapped in rigid polyiso.

1. 
   Shawnnixon1 | Dec 04, 2023 09:53pm | #6

   Sorrt why does the box need to be insulated??