Firstco HBXBX Air Handlers User Guide

June 16, 2024
FIRSTCO

Application Bulletin
Release Date: June 14, 2023

HBXBX Air Handlers

RE: Filter applications for 60 series HB air handlers with ECM motors
It has come to our attention that we have shipped HBXBX and VHBX model air handlers with a Merv 10 filter installed from the factory. In certain applications, with this high density Merv 10 filter, the unit may not achieve the certified air flow.
We recommend to achieve the certified ratings, that all units be changed to a Merv 3/4 standard filter. This can be done during installation or at the next filter change required.
For more specific application data on Merv 8 – 13 filters, I would refer you to the following publications:
First Co application bulletin: dtd 01/04/2018 Merv 11 and 13 Filters
First Co application bulletin: dtd 10/05/2009 Merv 8 Pleated Filters
These two publications have more detailed application data for where Merv 8 – 13 filters can be applied based on surface area and air flow requirements.

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