Description
Flue Rain Cap That Keeps Rain and Downdrafts Out of the Flue While the Heater Runs
An open flue takes snow and rain down to the heat exchanger, and a gust can push exhaust toward the burner. Frost Fighter manuals say you should use a vent cap where downdrafts are likely. The Frost Fighter 48808 Vent Cap is that cap: a galvanized flue rain cap, 6 in. inlet, for IDF and IDH flues, fitted while the heater runs.
Key Features and Benefits
- The Frost Fighter vent cap has a domed hood over a louvered skirt. The hood sheds rain and snow, the louvers let exhaust out, and the skirt shields the open pipe from wind.
- Galvanized steel stands up outdoors, so the flue rain cap stays on the flue all season.
- The 6 in. inlet matches the flue on Frost Fighter IDF and IDH heaters. It is the heater flue cap for those units, not for the 8 in. vent on the IHS700.
- The Frost Fighter vent cap stays on while the heater operates, so a rental unit ships capped and comes back capped.
Which Cap Do You Need
Three Frost Fighter heater parts look alike; pick by what the flue needs.
| Part | What it is | Use it when |
|---|---|---|
| 48808 Vent Cap 6 in. | Rain and vent cap, open louvers | The heater is running and the flue terminates outdoors |
| 48808A Flue Storage Cap 6 in. | Solid cover | The heater is parked and the flue should be closed |
| 48809A 3 ft Flue Extension with 6 in. Rain Vent Cap | Pipe and cap together | You want 3 ft more vertical run before the cap |
| 78809A 3 ft Flue Extension with 8 in. Rain Cap | 8 in. version | IHS700 heaters only |
Venting Rules From Frost Fighter's Manual
The flue must end in a vertical section at least 2 ft long with a suitable rain cap. Horizontal runs rise 1 in 10 away from the heater, and the chimney should hold 0.02 in. water column of draft. Outdoors, the IDF manual calls a 36 in. extension before the rain cap for flue pipe terminations highly advisable. Never run the unit in a partly ventilated area without a flue pipe. Venting on a Frost Fighter chimney flue follows CSA B149 (Canada) and NFPA 54 (US).
Which Heaters Use It
The flue rain cap fits every Frost Fighter heater with a 6 in. flue. Frost Fighter’s manuals give a 6 in. flue for IDF350, IDF500, IDH200QR, IDH400QR, and IDH500QR. A 6-inch flue rain cap does not fit the IHS series, which vents at 8 in.; theIHS700H and IHS700P take the 8 in. cap. DF direct-fired heaters have no flue and take no cap.
Specifications
| Spec | Value |
|---|---|
| Frost Fighter part | 48808 |
| Type | Rain and vent cap, domed hood with louvered skirt |
| Material | Galvanized steel |
| Inlet | 6 in. |
| Weight | 5 lb |
| Fits | 6 in. flue on Frost Fighter IDF and IDH indirect-fired heaters |
| Use | While the heater is operating |
| Not for | 8 in. flues (IHS700); closing a parked flue (use the 48808A storage cap) |
| Related parts | 48808A storage cap; 48807 3 ft extension, no cap; 48809A 3 ft extension with cap |
Buy Flue Rain Cap Online from Cleanflow
Cleanflow Utility Supply Company is an authorized Frost Fighter dealer and stocks this flue rain cap with the Frost Fighter heaters and accessories it fits, plus other Frost Fighter heater parts. Free shipping on orders over $199. Returns accepted within 30 days; email info@cleanflow.ca. Ships across Canada and the USA. Call 1-866-335-1078 to confirm your flue size.
Order the 6-inch flue rain cap as part 48808. For a parked heater, order the 48808A storage cap instead.
Frequently Asked Questions
What is a chimney rain cap?
A hood on top of a flue or chimney pipe. It keeps rain and snow out while exhaust leaves through openings under the hood. The Frost Fighter vent cap does this on the heater's flue outlet.
Do I need a rain cap on my chimney flue when the heater vents outdoors?
Yes. Frost Fighter's IDF manual requires a suitable rain cap outdoors, and the IDH manuals call for a vent cap where downdrafts are liable to occur. A rain cap for flue pipe terminations also keeps water out of the heat exchanger.
Flue cap vs rain cap: which Frost Fighter part do I need?
The rain cap (48808) stays on while the heater runs. The storage cap (48808A) is a solid heater flue cap that closes the pipe when the heater is parked. The storage cap is not for use while operating.
Is the Frost Fighter vent cap an anti-downdraft chimney cap?
Yes, in the sense that Frost Fighter uses. The hood and skirt keep wind from blowing down the pipe, which is why the manual calls for a vent cap where downdrafts are likely.
How high should a chimney cap be above flue outlets on the heater?
Frost Fighter's rule is a vertical flue section at least 2 ft long before the cap, after any horizontal run rising 1 in 10 away from the heater. If the Frost Fighter chimney pipe is short, 48809A adds 3 ft.
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