12FT Stainless Steel Braided Propane Hose Extension Assembly with 3/8" Female x 3/8" Male Flare for Gas Grill, RV Fire Pit The Listed size 24"x10" is

The Listed size 24"x10" is for inside duct opening measurement

namely UPC

Multi-shutter damper with easy handle to adjust desired amount of air flow

Sped Queen

then select the listed size of 14”x 8”

12FT Stainless Steel Braided Propane Hose Extension Assembly with 3/8" Female x 3/8" Male Flare for Gas Grill, RV Fire Pit The Listed size 24"x10" is12FT Propane Extension Hose Assembly with 3 8" female x 3 8" male flare fittings. Key Features: 304 stainless steel braided hose assemble with inner tubing made of flame resistant material and solid brass fittings for safety and durability standard 3 8" female x 3 8" male flare fittings Compliant with ANSI Z21. 54 CSA 8. 4 Working pressure 0 350PSIG Outdoor use only