5-7 days 4" PVC (100mm) to 4" Innoflue SW Centric Increaser

The ISIA10004 from Centrotherm is a Centric Increaser for 4” PVC (100mm) to 4” Innoflue SW vent pipes. Suitable for vertical installation only.


  • Innoflue SW (Single Wall) is the only polymer vent system on the market listed to UL 1738;
  • Accepted and approved by over 50 North Amercian manufacturers of boilers, water heaters and furnaces;
  • Suitable for natural gas, propane and fuel-oil condensing and non-condensing (flue temp. below 248°F) appliances;
  • All parts (pipe, fittings, etc. - both black and grey) are UV resistant and suitable for indoor or outdoor installation;
  • Requires no primer/glue and does not leach chloride like PVC & CPVC;
  • Costs less and is faster and easier to install than stainless steel venting, no special tools needed, zero clearance to combustibles;
  • Industry-leading 2mm wall thickness;
  • Built-in gasket allows for adhesive-free installation which can be adjusted at any time;
  • May be installed through a wall, chimney, chase or between joists;
  • Lightweight, requires minimal support;
  • Made in the USA from environmentally-friendly PolyPropylene (PP).
Product Type
Increasers & Reducers
Vent Type
Single Wall

4" PVC (100mm) to 4" Innoflue SW Centric Increaser

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  • 4" PVC (100mm) to 4" Innoflue SW Centric Increaser QR Code
  • Brand: Centrotherm
  • Model: ISIA10004
  • MPN: ISIA10004
  • Availability: 5-7 days
  • $ 114.95

Tags: Vent Pipes, Heating, Heating Supplies, Condensing Boilers, Heating and Cooling