Help Safety Notes

Safety Notes on Vent Pipe

    Know When To Include a Clearance Shield

    The most important aspect of safety while designing your venting system is maintaining clearances to combustible materials. Failure to maintain proper clearance is a severe fire hazard. Remember to use clearance shields whenever required. See the list below.

    • Attic Insulation Shield: use when passing through an attic
    • Firestop: use when passing through a second story
    • Radiation Shield: use when passing through a second story and an attic space
    • Wall thimble: use when passing through a wall
    • Mortar Sleeve: use when passign through a masonry wall
    • Ceiling Support: use when passing through a ceiling

    Know Your Clearance Requirements

    Reference the clearance guides below to find specific clearances by popular brands and collection types.


    • PelletVent Pro - 1 Inch
    • PelletVent - 3 Inches
    • Type B Gas Vent - 1 Inch
    • DuraFlex Stainless Steel - 1 Inch to Masonry
    • DuraFlex AL - 0 Inches to Masonry
    • DuraBlack Stove Pipe (Single Wall) - 18 Inches
    • DVL Stove Pipe (Double Wall) - 6 Inches
    • Direct Vent - 3 Inches


    • Class A - 2 Inches
    • Pellet Vent - 3 Inches
    • B Vent - 2 Inches
    • Flexible Liner - 2 Inches
    • Stove Pipe (Single Wall) - 18 Inches
    • Stove Pipe (Double Wall) - 8 Inches
    • Direct Vent - 3 Inches

    Know When Support Brackets Are Required

    Support brackets are required when running pipe vertically along a wall, or additionally above the roof. See the list below for specific requirements.

    • Wall Support Band: required every 5 to 7 feet
    • Extended Roof Support: required when more than 5 feet above the roofline
    • Elbow Strap: required whenever there is an offset
    • Firestop: required when passing through a second story floor

    Always Check Local Code

    Remember to contact your local code office before proceeding with your installation. Some counties have abnormal requirements for clearances, and even types required for your appliance. If you choose to ignore local code requirements, please keep in mind that your installation will not pass general inspection, and there could be potential fire hazards.

    Some clearances that may differ from county to county are:

    • Clearance to windows/doors/air inlets
    • Clearance from the ground
    • Clearance from a sidewalk/path
    • Minimum roof termination distance (how far the pipe is above)

    Some type requirements that may differ:

    • Triple-wall pipe may be required where double-wall is normally sufficient.

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