Hood Air Intake and Velocity Requirements

Process Type of Hood or Slot Average Intake Velocity (FPM)
Aluminum Furnace Enclosed Hood, Open One Side
Canopy Hood
150-200
200-250
Brass Furnace Enclosed Hood, Open One Side
Canopy Hood
200-250
250-300
Chemical Laboratory Enclosed Hood, Front Opening
Down Draft, Table Type
100-150
150-200
Degreasing Canopy Hood
Slotted Sides, 2” – 4” Slots
150
1500-2000
Electric Welding Portable Hoods, Open Face
Open Front Booth
200-250
100-150
Foundry Shakeout Down Draft, Grill Table
Open Front Booth
250-450
150-200
Flour, Grain, Wood Dust Canopy Hood
Side Slots, 3” – 4”
500
2000-2500
Kitchen Ranges Canopy Hood 125-175
Metal Spraying Open Front Booth 150-200
Paint Spraying Open Front Booth 100-175
Paper Machine Drying Canopy Hood 250-300
Pickling Tanks Canopy Hood
Slotted Sides
200-250
250 CFM per sq. ft. of tank surface
Plating Tanks Canopy Hood
Slotted Sides
225-250
250 CFM per sq. ft. of tank surface
Rubber Macerator Canopy Hood
Slotted Sides, 2” – 4” Slot
200-250
2000-2500
Steam Tanks Canopy Hood 125-175
Varnish Tanks Canopy Hood
Slotted Sides, 2” – 4” Slot
225-300
2000-2500