Re: Ventilator w MERV 12 filter - filter changeout management

[Guest guest]

Shell: Another approach for knowing when to a replace a filter is by measuring its pressure drop.Either the manufacturer would have a recommendation here, or I believe a rule of thumb wasa doubling of the pressure drop. Let's say a new filter had a pressure drop of 0.5 Inches,it should be replaced when the pressure drop rises to one inch.Pressure measurement could be done by the installation of a magnehic gauge or a similar device BeargLife Energy Associateswww.LifeEnergyAssoc.com20 Darton StreetConcord, MA 01742To: iequality Sent: Tuesday, February 14, 2012 4:35:37 PMSubject: RE: Ventilator w MERV 12 filter

We added a whole house filter to our air

handler with Merv 12 and found the filter clogging up quickly enough to freeze

AC after about 5 weeks. We weren’t the only unhappy customers because

AprilAir came out with Merv 10 filters for the same unit about that same time.

Merv 10s have worked better, but we still have to change about every 2 months

in AC season and every 3 months other times.

Shell Bleiweiss

Law Offices of Shell J. Bleiweiss

Environmental and OSHA Law

Offices in Chicago

and Barrington, Illinois

sbleiweiss@...

http://www.shell-bleiweiss.com

From:

iequality [mailto:iequality ] On Behalf Of barb b w

Sent: Tuesday, February 14, 2012

12:35 PM

To: iequality

Subject: Ventilator w

MERV 12 filter

Found this energy recovery ventilator w a MERV 12

filter.

http://www.ultimateair.com/products/standard-features/