iSi North America AMV8 User Manual

Proper Chimney

Termination?

(Check 1)

Line, terminate with

listed vent cap

(Fix 1)

Yes

Chimney channel

free of solid and

liquid fuel

appliances?

(Check 2)

Change venting

arrangements

(Fix 2)

Yes

Crown in good

condition

(Check 3)

Rebuild crown

(Fix 3)

and/or Reline

(Fix 4)

Yes

Reline
(Fix 4)

Cleanout free of

debris?

(Check 4)

Liner in good

condition?

(Check 5)

Yes

Reline
(Fix 4)

Dilution air

available?

(Check 6)

Complete the

installation.

(Check 7)

HECK

1 - P

ROPER

CHIMNEY

TERMINATION

A masonry chimney used as a vent for gas fired equipment must
extend at least three feet above the highest point where it passes
through the roof. It must extend at least two feet higher than any
portion of a building within a horizontal distance of 10 feet. In
addition, the chimney must terminate at least 3 feet above any
forced air inlet located within 10 feet. The chimney must extend at
least five feet above the highest connected equipment draft hood
outlet or flue collar.

If the chimney does not meet these termination requirements, but
all other requirements in the checklist can be met, it may be
possible for a mason to extend the chimney. If this will not be
practical, see Fix 1.

Researchers have discovered that the winter design temperatures
have a direct impact on the suitability of this type of venting. In
most situations, the existing masonry chimneys will require a
properly sized metallic liner.

W ARNING

O S SIB ILITY O F P R O P ER T Y D A M A G E , P ER S O N A L IN J U R Y O R D E AT H

D A M A G IN G C O N D E NS A TIO N C A N O C C U R IN SID E M A SO N RY C H IM N E YS W H EN A

S IN G LE FA N A S S IS T ED

AT E G O R Y

A P PLIA N C E (80 %

AFU E

F U R NA C E ) IS

V EN TED W ITH O U T A D E Q U A TE D ILU TIO N A IR .

O N O T C O N N E C T A N 8 0%

FU R N A C E TO A M A S O N R Y C H IM N EY U N L ES S TH E FU R N A C E IS C O M M O N V EN T E D

W ITH A D R AF T H O O D EQ U IPP ED A P PLIA NC E O R TH E C H IM N EY IS LIN E D W ITH A

M ET A L L IN E R O R

Y PE

M E T A L V E N T.

LL IN S TAL LA TIO N S U SIN G M A S O N RY

C H IM N EY S M U S T B E S IZED IN A C C O R D A N C E W IT H TH E A P P R O PR IATE V EN T IN G

TA B LES .

F A N 8 0 % F U R N A C E IS C O M M O N V EN TE D W ITH A D RA FT H O O D

E Q U IP PE D A P P LIA N C E, T H E P O TE N TIA L FO R C O N D E N SA TIO N D A M AG E M A Y

S T ILL E X IS T W ITH EXTR E M E LY C O LD C O N D ITIO N S, LO N G VE N T C O N N E CTO R S ,

E XT ER IO R C H IM N E Y S , O R A N Y CO M B IN A TIO N O F TH E SE C O N D ITIO N S.

H E

R IS K O F C O N D EN S A T IO N D AM A G E IS B E ST A VO ID ED B Y U S IN G THE M A S O N R Y

C H IM N EY A S A P A TH W A Y FO R PR O PER L Y S IZE D M ET A L LIN ER O R

YP E

M ET A L V E N T.

Wash

Crown

Clay Tile Size: 8" x 8" x12"

(Each x 24" Length)

Clay Tile Size Generally
12" x 12" (24" Length)

1/2" to 1" Air Space

Second Floor

First Floor

Attic Floor

Roof Line

Throat

Damper

Breech

Clean Out

Fan Assisted
Forced Air
Furnace

Natural Draft
Water Heater

Water Heater
Vent Connector

Basement Floor

F.A.F. Vent
Connector

Figure 8 - Typical Multiple Flue Clay Tile Chimney

HECKLIST

UMMARY

This checklist serves as a summary of the items to be checked
before venting an 80+ furnace into a masonry chimney. In addition,
we recommend that a qualified serviceman use this checklist to
perform a yearly inspection of the furnace venting system.

This checklist is only a summary. For detailed information on
each of the procedures mentioned, see the paragraph referenced
with each item.

This inspection is based upon a draft topical report, “Masonry
Chimney Inspection and Relining”, issued by the Gas Research
Institute. While not yet finalized, we believe this report represents
the best information on this subject which is currently available.