Tjernlund PAI-4 Combustion Air In-Forcer

Combustion Air In-Forcer; Capacity 450000 BTU/Hour (Gas Draft Hood), 850000 BTU/Hour (Fan Assisted/Power Burner), 775000 BTU/Hour (Oil Fired Flame Retention); Air Flow Rate 250 CFM; Size 20 Inch Length x 12 Inch Width x 9-1/2 Inch Height; Mounting Integral Bracket, Wall/Roof; Application Commercial; Includes Fan Proving Pressure Switch, Outdoor Air Pre-Filter