FMI (V)S36 manual 6

Venting Installation

Optional Outside air Kit (Model ak4/ak4f)

The installation of an outside air kit should be performed during the rough framing of the fireplace due to the nature of it's location. Outside combustion air is accessed through a vented crawl space (AK4F) or through a sidewall (AK4). See Figure 22 on page 13 for instruction of operating air kit.

CAUTION: Combustion air inlet ducts shall not terminate in attic space.

The maximum height for the air vent can not exceed 3 feet below the flue gas outlet of the termination.

Secure to Collars with Metal Tape, Screws or Straps (Min. of 1/4" x 20" in size)

Air Inlet

Location

Must Allow For Bushes or Snow

	Air Inlet
	Eyebrow
Vented Crawl Space	Vent Hood
	Required for
(Check Local Codes
	Wall Installation
Before Installing in a
Vented Crawl Space)
Figure 5 - Outside Air Kit

Chimney Pipe

The FMI PRODUCTS, LLC chimney system

consists of 12", 18", 24", 36" and 48" snap- lock, double-wall pipe segments, planned for maximum adaptability to individual site requirements. Actual lengths gained after fitting overlaps must be taken into consideration

(lineal gain) and are given in the lineal gain

chart (see Figure 6). Lineal gain is the actual measurable length of a part after two or more parts are connected. For Canada, use chimney

parts designated "HT".

WARNING: The opening in collar around chimney at top of fireplace must not be obstruct- ed. Never use blown insulation to fill chimney enclosure.

LINEAL GAIN

PART NO.	DESCRIPTION	GAIN
36"	Fireplace	40"
12-8DM	Pipe Section	10 5/8"
12-8HT
18-8DM	Pipe Section	16 5/8"
18-8HT
24-8DM	Pipe Section	23 5/8"
24-8HT
36-8DM	Pipe Section	34 5/8"
36-8HT
48-8DM	Pipe Section	46 5/8"
48-8HT
RT-8DM	Round Termination	6 7/8"*
RTL-8DM	Round Termination	7 3/4"*
RTT-8DM	Round Termination	6 7/8" to
	with Slip Section	23 1/8"*
RTTL-8DM	Round Termination	8 1/2" to
	with Slip Section	21 1/2"*
ET-8DM	Square Chase-Top	12"*
ETO-8DM	Square Chase-Top	12"*
	with Mesh
ETL-8DM	Square Chase-Top	7" to 15"*
	with Slip Section
	Square Chase-Top	12" to
ETLO-8DM	with Mesh & Slip
		25 1/2"*
	Section

*The lineal gain for the terminations is mea- sured to the flue gas outlet height.

12 3/8" Galvanized

Outer Pipe

8" Stainless	Hemmed
	End
Inner Pipe

Figure 6 - Lineal Gain

Assembly and installation of double wall chimney system

Each double wall chimney section consists of a galvanized outer pipe, a stainless steel inner flue pipe and a wire spacer. The pipe sections must be assembled independently as the chimney is installed.

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