18" Diameter - 90° Degree Adjustable Elbow - 1 PACK Fixed Blades with Damper + Product Description Brazing is

+ Product Description Brazing is a metal joining process utilizing a filler metal that melts above 840 Degrees F and below the melting point of the base metals

+ Product Details Size - 28"w X 36"h X 2"d (for duct opening measurement only)

Actual Filter Size – 7 3/4"w x 31 3/4" x 1"

the actual front end outer dimensions are 8" in diameter

even without needing to remove the thermostat

18" Diameter - 90° Degree Adjustable Elbow - 1 PACK Fixed Blades with Damper + Product Description Brazing is+ Product Details Size 18" round duct sheet metal elbow 30 gauge galvanized crimped end connection adjustable from 5 90 Premium Quality Made of galvanized metal to prevent corrosion, oxidation & rust from water & moisture that lasts longer requiring less maintenance Save money with this energy efficient material, maximizes airrflow and reduces fire hazards. Applications 30 Gauge thick & made of thick & durable galvanized sheet metal used for HVAC