Make Up Air / Rooftop Supply Fans Kitchen Ventilation Ductwork Exhaust Fans Make Up Air Rooftop Supply Fans Inline Supply Fans Gravity Vents Make Up Air Heaters Parts & Accessories Untempered Rooftop Supply Fan Make Up Air Unit (MUA) with 15" Fan Wheel, 1.0 HP 208 Volt Three Phase Direct Drive Motor, 800-2500 CFM (MODEL MH-A1-15D) $1,959.99 Add To Cart (Ships in 4-5 Days) Untempered Rooftop Supply Fan Make Up Air Unit (MUA) with 20" Fan Wheel, 1.5 HP 208 Volt Three Phase Motor, 2500-3750 CFM (MODEL MH-A2-20D) $2,649.99 Add To Cart (Ships in 4-5 Days) Untempered Rooftop Supply Fan Make Up Air Unit (MUA) with 24" Fan Wheel, 5.0 HP 208 Volt Three Phase Direct Drive Motor, 3750-6500 CFM (MODEL MH-A3-24D) $3,599.99 Add To Cart (Ships in 4-5 Days) Untempered Rooftop Supply Fan Make Up Air Unit (MUA) with 30" Fan Wheel, 5.0 HP 208 Volt Three Phase Direct Drive Motor, 6500-10,000 CFM (MODEL MH-A4-30D) $6,029.99 Add To Cart (Ships in 4-5 Days)