Item # bci1070261

Metalbest QC Type B Gas Vent 18" to 20" Increaser

Model: 118320

from the QC Collection
Finish: Choose Finish
  • Galvanized
    Special Order

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Product Overview

Type B Gas Vent 18" to 20" Increaser from the QC Collection

This gas vent increaser allows you to adapt 18" diameter pipe to 20" diameter pipe when required for your application.

The QC series offers round gas vent pipe and fittings for large residential, industrial and commercial applications. Its adjustable length pipes eliminates the need for all cutting, fitting and special engineering. It features double wall pipe with built-in air space to reduce clearances and durable galvanied outer pipe with die formed ends.


  • Large residential, industrial and commercial applications
  • Materials: Galvanized steel outer and aluminum inner liner
  • Fuel: Gas
  • UL 441 listed
  • Minimum Safety Clearance to Combustibles:
    • 1" for diameters of 10" to 24"
    • 2" for diameters 26" to 48"
  • Warranty: Lifetime Limited Warranty

This product is listed under the following manufacturer number(s):

Dimensions and Measurements

Outside Diameter
18.5, 20.5 in.
Pipe Inside Diameter
18, 20 in.

Characteristics and Features

Galvanized Steel, Aluminum
Pipe Class
Type B
Pipe Shape
Vent Construction
Double Wall

Electrical and Operational Information

Fuel Type

Warranty and Product Information

Approved for Commercial Use
Manufacturer Warranty
Limited Lifetime