DuraVent FasNSeal 3" 29-4C Stainless Steel Universal Appliance Adapter With Test Port btu17500 you can use this heater

you can use this heater with no worries and focus on the task at hand

Permanent Chimney Opening 39 sq

giving your fireplace a little added detail and additional reflection spots within your fireplace

When combustion happens in woodstoves

DuraVent FasNSeal 3" 29-4C Stainless Steel Universal Appliance Adapter With Test Port btu17500 you can use this heaterAll FasNSeal (single wall) vent lengths and components feature patented built in mechanical locking band and triple lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90 from mechanical locking bands. This construction feature allows for ease of installation. The air space between the inner and outer wall on FasNSeal W2 helps to reduce the clearance to combustibles in addition to creating a heat shield