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Operable

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CFM145a
DV Termin Location
5/01/01 Rev. 12/05/01 
sta

INSIDE

CORNER DETAIL

CFM145a

Fig. 11 Vent termination clearances.

  A =  Clearance above grade, veranda, porch,  

12” (30cm) 

 

12” (30cm)

   

deck, or balcony

  B =  Clearance to window or door that may be  

6” (15cm) for appliances  

6” (15cm) for appliances

   

opened 

< 10,000Btuh (3kW), 12” (30cm)  

< 10,000 Btuh (3kW), 9”

   

 

for appliances > 10,000 Btuh (3kW) and 

(23cm) for appliances > 10,000

   

 

< 100,000 Btuh (30kW), 36” (91cm) 

Btuh (3kW) and < 50,000 Btuh

   

 

for appliances > 100,000 Btuh (30kW) 

(15kW), 12” (30cm) for 

   

 

 

 

appliances > 50,000 Btuh (15kW)

  C =  Clearance to permanently closed window 

12” (305mm) recommended to 

12” (305mm) recommended to 

   

 

prevent window condensation 

prevent window condensation

  D =  Vertical clearance to ventilated soffit located

   

above the terminal within a horizontal  

18” (458mm) 

 

18” (458mm)

   

distance of 2’ (610mm) from the center

   

line of the terminal

  E =  Clearance to unventilated soffit 

12” (305mm) 

 

12” (305mm)

  F =  Clearance to outside corner  

see next page 

 

see next page

  G = Clearance to inside corner (see next page) 

see next page 

 

see next page

  H =  Clearance to each inside of center line 

3’ (91cm) within a height of 15’ (5m) 

3’ (91cm) within a height of 15’

   

extended above meter/regulator assembly 

above the meter/regulator assembly 

(5m)above the meter/regulator  

   

 

 

 

assy

  I =  Clearance to service regulator vent outlet 

3’ (91cm) 

 

3’ (91cm)

  J =  Clearance to nonmechanical air supply inlet  6” (15cm) for appliances < 10,000 

6” (15cm) for appliances

   

to building or the combustion air inlet to any  Btuh (3kW), 12” (30cm) for 

< 10,000 Btuh (3kW), 9”

   

other appliances 

appliances > 10,000 Btuh (3kW) and <  

(23cm) for appliances > 10,000

   

 

100,000 Btuh (30kW), 36” (91cm) 

Btuh (3kW) and < 50,000 Btuh

   

 

for appliances > 100,000 Btuh (30kW) 

(15kW), 12” (30cm) for  

   

 

 

 

appliances > 50,000 Btuh (15kW)

  K =  Clearance to a mechanical air supply inlet 

6’ (1.83m) 

 

3’ (91cm) above if within 10’

   

 

 

 

(3m) horizontally

  L =  Clearance  above paved sidewalk or paved  7’ (2.13m)† 

 

7’ (2.13m)†

   

driveway located on public property

  M = Clearance under veranda, porch, deck or 

12” (30cm)‡ 

 

12” (30cm)‡

   

balcony 

 

 

 

  N =  Clearance above a roof shall extend a minimum of 24” (610mm) above the highest point when it passes through the roof   

  surface, and any other obstruction within a horizontal distance of 18” (450mm).

  1 In accordance with the current CSA-B149 Installation Codes

  2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes

  † A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and serves both  

  dwellings

  ‡ only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor:

  NOTE:  1. Local codes or regulations may require different clearances.

    2. The special venting system used on Direct Vent Stoves are certified as part of the appliance, with clearances tested and approved by the  

    listing agency.
    3. CFM Corporation assumes no responsibility for the improper performance of the appliance when the venting system does not  

 

    meet these requirements.