As a result of the current high standards in heat insulation and air-tightness, air no longer moves in-and-out of houses freely thus retaining indoor air pollution. Adding a mechanical filter to your forced air heating system is an efficient way to capture some of these airborne particles. Stelpro filters are available in several different sizes and ratings to meet your specific needs and requirements.

{features}

manufacturing

The precise alignment and spacing of the filter pleats allows for an even air distribution. The filter geometry maximizes particle capture by trapping the large particles in the pleat valley while the smaller size particles stick to the pleat slopes.

installation

These filters fit into the robustly constructed SFRF filter housing. Made of galvanized steel, the SFRF has a modular track system that makes it adaptable to a variety of filters sizes.

warranty

10 year warranty (SFRF housing).

{selection table}

{filters & racks}
products	nominal dimensions	MERV	static pressure function of airflow velocity (w.c @ cfm)
code	H x W x D (in)		medium airflow (cfm)	high airflow (cfm)
SFRF16253	16 x 25 x 3	7	0,10 @ 791	0,30 @ 1582
SFRF16254	16 x 25 x 4	8	0,22 @ 1390	0,30 @ 1670
SFRF16255	16 x 25 x 5	11	0,05 @ 781	0,32 @ 1562
SFRF20204	20 x 20 x 4	8	0,22 @ 1390	0,30 @ 1670
SFRF20205	20 x 20 x 5	11	0,05 @ 781	0,32 @ 1562
SFRF20254	20 x 25 x 4	8	0,22 @ 1735	0,32 @ 2085
SFRF20255	20 x 25 x 5	11	0,05 @ 984	0,32 @ 1968

{filters only}
products	nominal dimensions	MERV	area
code	H x W x D (in)	nb	ft.sq
SF16253	15,5 x 24,2 x 3,0	7	12,4
SF16254	15,5 x 24,5 x 3,75	8	14,4
SF16255	15,75 x 24,1 x 4,9	11	20,3
SF20204	19,5 x 19,5 x 3,75	8	14,4
SF20205	20,6 x 20,6 x 4,9	11	20,6
SF20254	19,5 x 24,5 x 3,75	8	18,0
SF20255	19,6 x 24,1 x 5,0	11	25,7

These filters have a 50-85% efficiency in the 3-10 microns range. In comparaison, upgrading to a MERV 11 filter can increase efficiency up to 79.9% in the 1-3 microns range.