DUCTWORK

DUCTWORK

Factory Built Grease Duct Systems. UL listed, requires No Welding - Single Wall & Reduced Clearance: UL1978 and
Double Wall Zero Clearance: UL1978 & UL2221, Limited Lifetime Warranty.

NAKS Grease Duct Product Offering
Products Inner
Diameter
(ID)
Outside
Diameter
(OD)
Clearance To
Combustibles
Clearance To
Non-
Combustibles
Total Footprint
Single Wall 10 - 22" ID 18" 0" OD+Clearance
Double Wall
Reduced Clearance
10"-14" ID+2.5 2" 0" OD+Clearance
Double Wall
Reduced Clearance
16"-22" ID+2.5 3" 0" OD+Clearance
Double Wall
Zero Clearance
10"-22" ID+6.5 0" 0" OD+Clearance
200 CFM/foot Medium Duty
Hood Length (ft.) 200 CFMS
Linear FT.
Ductwork
Dia.
Hood Conn.
Dia.
3'-0" to 5'-5" 600-1075 10 10
5'-6" to 7'-5" 1100-1475 12 12
7'-6" to 9'-11" 1500-1975 14 14
10'-0" to 10'-11" 2000-2100 16 10(2)
11'-0" to 15'-5" 2200-3175 18 12(2)
15'-6" to 20'-0" 3100-4000 20 14(2)
250 CFM/foot Heavy Duty
Hood Length (ft). 250 CFMS/
Linear FT.
Ductwork
Dia.
Hood Conn.
Dia.
3'-0" to 4'-5" 750-1125 10 10
4'-6" to 5'-11" 1150-1475 12 12
6'-0" to 7'-11" 1500-1975 14 14
8'-0" to 9'-11" 2000-2475 16 10(2)
10'-0" to 11'-11" 2500-2975 18 12(2)
12'-0" to 15'-5" 3000-3850 20 14(2)
15'-6" to 20'-0" 3875-5000 22 16(2)

Please refer to the Duct Diameter sizing chart by Hood Size and CFMS.

State of the art Stainless Steel grease duct systems are NFPA-96 compliant, designed to safely convey grease laden vapors from commercial kitchen cooking equipment. Combining industry leading performance with ease of installation, NAKS factory-built grease duct systems incorporate a steel to steel overlapping conical joint which requires no field welding. This joint design critically protects the seal surface and withstands high pressure washings. Double wall and large diameter single wall options incorporate flanged connections and clamp bands for maximum rigidity. Innovative accessories including cutable lengths, built in access doors on offsets, and no weld hood adapters all combine to make this your best ducting option.