Originally Posted By: poffenberger This post was automatically imported from our archived forum.
merv ratings… uv lights… return… above a-coil… eac’s, we know eac’s are cfm specific , 1"filters, pleated , 1" filters claiming to be a merv 8… or do we just say it is operational.
Originally Posted By: ecrofutt This post was automatically imported from our archived forum.
Huh?
EAC's (Electronic Air Cleaners) are CFM Specific.
ASHRAE 52.2 defines the MERV (Minimum Efficiency Rating Value)
Standard 52.2 lists approximate dust-spot efficiencies and corresponding MERV
values. For example:
l MERV values of 8 and higher correspond to dust-spot efficiencies of more
than 30 percent.
l MERV values of 13 and higher correspond to dust-spot efficiencies more
than 80 percent.
l MERV values of 15 and higher correspond to dust-spot efficiencies more
than 95 percent.
So, 30 percent pre-filters will eventually be replaced with filters with a MERV
rating of 8. Similarly, existing 80 percent filters will have a new rating of MERV
13, and 95 percent filters a new rating of MERV 15.
Originally Posted By: poffenberger This post was automatically imported from our archived forum.
Got a little carried away. indoor air quality is getting attention now more than ever. UV lights in returns and above a-coils have to be replaced, lets just say once a year. Just wondered how inspectors are talking with clients about indoor air quality, fresh-air exchangers,air filters,combustion-air…etc…
Originally Posted By: Blaine Wiley This post was automatically imported from our archived forum.
Personally I don’t mention indoor air quality. If the client presses me on the issue I simply refer them to an indoor air quality specialist. I do mention the importance of changing the HVAC filter regularly, and having annual professional maintenance on the system.
Indoor air quality and combustion air are two different items. I check for adequate combustion air to the furnace and/or water heater, especially when either is located in a confined space.
indoor air quality is getting attention now more than ever. UV lights in returns and above a-coils have to be replaced, lets just say once a year. Just wondered how inspectors are talking with clients about indoor air quality, fresh-air exchangers,air filters,combustion-air…etc… 