Vanguard Heating Gas Log Heater User Manual

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When used as a vented heater, appliance must be installed only in a solid-

fuel burning fireplace with a working flue and constructed of non combustible
material.
If your heater is a manually controlled model, you may use this heater as a vented
product. There are three reasons for operating your heater in the vented mode.
1. The fireplace does not meet the clearance to combustibles requirements for

vent-free operation.

2. State or local codes do not permit vent-free operation.
3. You prefer vented operation.

If reasons number 1 or 2 above apply to you, you must permanently open chimney flue
damper. You must install the damper clamp accessory (to order, see Accessories, page
34). This will insure vented operation (see Figure 10). The damper clamp will keep
damper open. Installation instructions are included with clamp accessory.

See chart below for minimum permanent flue opening you must provide. Attach
damper clamp so the minimum permanent flue opening will be maintained at all times.

6' to 15'

39 sq. inches

15' to 30'

29 sq. inches

5"

20 sq. inches

6"

29 sq. inches

7"

39 sq. inches

8"

51 sq. inches

Damper

Damper
Clamp

Damper
Clamp

Damper

Damper