If we install a non-combustible mantel over a LP fireplace, do we still need to worry about vertical clearance?

[kjmitchell22]

I'm looking at some very large LP gas fireplaces. We found a non-combustible mantel we like and want to put it about six inches above the fireplace blower. But the installation guides for these fireplaces talk about vertical clearances of 12" and even up to 22".

If the mantel is non-combustible, within reason, can it go as close to the blower as we want?

 

[gthomas785]

Usually, the clearances listed are "to combustibles". Generally non combustible materials can be as close as you want.
Now, it's possible the manufacturer wants certain airflow clearances for the unit to cool itself, or some other reason. If the manual doesn't explicitly say the clearances are to combustible materials, then you may want to give them a call to clarify.

 

[Millbilly]

Explain close to the blower? On almost all models the blower is in the rear bottom underneath the firebox. Rarely do I see small fans on top of the fireplace.

 

[Lennox65]

I'm looking at some very large LP gas fireplaces. We found a non-combustible mantel we like and want to put it about six inches above the fireplace blower. But the installation guides for these fireplaces talk about vertical clearances of 12" and even up to 22".

If the mantel is non-combustible, within reason, can it go as close to the blower as we want?

Every fireplace will have its own specific clearance requirements. They are specific and don't include language like," within reason or as close as we want".

A non combustible mantle mounted too close to the fireplace opening can cause the glass panel to explode by creating a heat dam.

It will also overheat the combustible wall materials, potentially causing a fire behind the wall.

You should follow exactly the supplied manufacturers instructions in regards to this.