The hallmark of the M4 model is its high efficiency. In fact, it is the most energy efficient, conventional vent residential product we offer. Extra insulation, pipe wraps and integral heat traps combine to reduce stand-by heat loss.
(Sample model numbers include: M-4-40T6FBN, M-4-403S6FBN, M-4-5036FBN)
Defender Safety System features
- Advanced ScreenLok® Technology Flame Arrestor design
- Resettable thermal switch
- Piezo ingiter
- Maintenance free
- Pedestal base
- Sight window
Standard Energy Saver features
- Fully automatic controls
- Factory installed Hydrojet® Total Performance System
- Vitraglas® lining
- Factory installed dielectric waterway fittings
- Flue baffle
- Protective magnesium anode rod
- Snap-lock draft diverter
- T&P relief valve included
- 2" Non-CFC foam insulation
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