Monessen Hearth mhsc eyf18 User Manual

15

Damper Stop

Damper

BEFORE FULLY INSTALLING THE UNIT:
 • Turn 

OFF the gas supply to the fireplace or firebox.

  •  Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting 

may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper.

Manual and millivolt controlled gas logs may be installed as a vented decorative log set in compliance with ANSI Z21.60 
and National Fuel Gas Code, Section 6.6 Since, the gas logs are operated with the damper open, non-combustible material 
and minimum mantel requirements do not apply.

BEFORE INSTALLING THE APPLIANCE:
  •  Turn off gas supply to fireplace or firebox.
  •   Have the fireplace floor and chimney professionally cleaned to remove ashes, soot, creosote or other obstructions. Have 

this cleaning performed annually after installation.

  •  Seal any fresh air vents or ash clean-out doors located on floor or wall of fireplace. If not, drafting may cause pilot out-

age or sooting. Use a heat-resistant sealant. Do not seal chimney flue damper.

DAMPER STOP INSTALLATION:
A damper stop must be provided with the unit. Contact 
your dealer to obtain one. The damper stop must be 
installed as shown in Figure 11 to prevent full closure 
of the fireplace damper blade and provide a minimum 
29 square inch flue opening.

This appliance is for installation only in a solid fuel burning fireplace (masonry fireplace 
or manufactured fireplace) with a working flue and constructed of noncombustible 
material.
Exception:  DO NOT install this appliance in a factory-built fireplace that includes 
instructions stating that it has not been tested or should not be used with unvented 
gas logs.