Mastic 91P Manuale Utente

14                                                                                                                                                       

15

 

VENT INSTALLATION 

Vent Terminal

Air Supply Inlet

Area Where Terminals Not Permitted

Inside Corner Detail 

FOR HORIZONTAL TERMINATION

MINIMUM DISTANCES 

A =  Clearance above the grade, a veranda, porch, deck, or balcony [*12" (305mm) minimum]. 

 

B =  Clearance to window or door that may be opened 

[*12" (305mm) minimum]

. 

C =  Clearance to permanently closed window [*minimum 12" (305mm) recommended to prevent condensation on window]  

 

D

 

=  Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of two (2) feet (610mm) from 

the centerline of the terminal [18" (457mm) minimum].  

E

 

=  Clearance to unventilated soffits [12" (305mm) minimum]. Clearance to vinyl soffit [30" (762mm)]. 

F =  Clearance to an outside corner. 

[*12" (305mm) minimum].

G = Clearance to an inside corner. 

[*12" (305mm) minimum]

 

H = *Not to be installed above a gas meter/regulator assembly within three (3) feet (914mm) horizontally from the centerline of 

the regulator. 

I =  Clearance to service regulator vent outlet [*3' (914mm) minimum]. 
J =  Clearance  to  non-mechanical  air  supply  inlet  to  building  or  the  combustion  air  inlet  to  any  other  appliance  [*12" 

(305mm) 

minimum]. 

K =  Clearance to a mechanical air supply inlet [*6' (1829mm) minimum]. 
L

 

=  Clearance above a paved sidewalk or paved driveway located on public property [

**

7' (2133mm) minimum]. 

M

 

= Clearance under veranda, porch, deck, or balcony [*12" (305mm) minimum

***

].

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" (457mm). 

* 

As specified in CAN/CGA B149 Installation Codes. Note: Local codes or regulations may require different clearances. 

**  A vent must 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 of two sides beneath the floor.

WARNING