Martin MDV12P Operation Manual page 10

VENTILATION INSTALLATION continued
MDV20 66 cm (26'')
MDV12 38 cm (15'')
MDV8 30 cm (12'')
Screw
24 cm (9-7/16'')
21 cm (8-1/4'')
Gas valve
Gas
connection
Mounting Details
Drywall anchor
Spacer
10
MDV20
MDV12
MDV8
20 cm (7-7/8'')
11 cm (4-5/16'')
Thimble only for models
MDV12 & MDV20
Putty
See mounting details