Replies

1. 
   STEPHEN SHEEHY | Nov 21, 2016 08:05pm | #1

   I replaced my HRV filters with MERV 13 filters. I assume all HRVs have filters. Mine (Zehnder) came with MERV 8, I think.
   I don't know that filters will stop smoke particulates, though. Supposedly, a MERV 13 will remove "most smoke," whatever that means.

2. GBA Editor
   Martin Holladay | Nov 22, 2016 03:51am | #2

   Bill,
   I don't advise you to turn off your HRV on these "bad air" days, but Stephen is right: a filter with a MERV rating will filter particulates (although there will always be some particulates that common filters can't handle).

   The higher the MERV number, the smaller the particles that it can filter. There is a downside to a MERV filter with a high number: it raises the static pressure of your ventilation system, increasing the load on your fan motors (and therefore increasing your energy bills). Check with the HRV manufacturer to determine what type of MERV filter will work with your particular HRV.

3. 
   nvman | Nov 22, 2016 09:54pm | #3

   The MERV 13 filters will remove some of the particulates but only activated carbon/ charcoal will remove all the wood smoke. However, it is a much more expensive filtration system than just a pleated filter as they are generally added to the fresh air supply leaving the HRV. They also have a built-in fan reduce the back pressure of the filter. Lennox makes one such model. I cannot attest to how effective it is or how much it costs to run. If no one has sensitivities in your home, you may be fine with the MERV 13 filter. There are also,stand alone air purifiers if necessary. IQ Air makes a good model. Not cheap but effective.