The 91-013 is the 20” x 20” x 5” replacement
Progressive Media air filter for the following
Ultravation models:
Progressive
Media Straight-Through
Design
Whole House Air
Cleaner models:
90-016
Photronic
Straight-Through Design Multistage
Whole House Air Cleaner Models:
92-031, 92-032, 92-033, 92-121, 92-122, 92-123
The 91-013 replacement filter uses Ultravation
Progressive Media Filtration with Ultrastrand
fiber technology, which meets and exceeds MERV
11 (ASHRAE 52.2) performance standards. Ultravation
MERV 11 filters can capture particles as small
as .3 microns in size. The specially shaped
surface of an Ultrastrand fiber captures and
holds particles far better than the typical
round fiber. To increase capture ability still
further, Ultrastrand fibers carry a permanent
electrostatic charge that attracts particles
like a magnet.
Ultravation Progressive Media design increases
fiber density from the upstream to downstream
side, gathering the largest particles in the
first part of the filter, while progressively
smaller particles are captured through the filter.
As a result, the media becomes filled edge to
edge, providing very high dirt holding capacity.
The manufacturer recommends you change the
filter every 6 months under normal operating
conditions.