Help with chimney sealing topper please!

[Robster]

I have a wood burning brick fireplace we rarely use. It just has a bird cage top on the terra cotta pipe. about 8x12 inch pipe.
I want to put to good sealing topper on it. I saw the lyemance and thought my birdcage could fit over it also.
I was about to buy one but it says not for use with gas logs. We might want to do gas logs in the future.
Anyone know why they don't want it used with gas logs? Pilot light? Gets too hot for it?
The other option is that weird pop up looking thing I guess. Suggestions welcome!
Thanks!
My first post here

 

[Robster]

Answering my own question here. I spoke to a better trained person at Woodland direct.
The reason not to use it with gas logs is if you light a fire you will not see any smoke building up in your house if its closed.
With a wood fire you would be alerted that the damper is closed by the smoke.
Just common sense open damper then light fire.

 

[bholler]

Answering my own question here. I spoke to a better trained person at Woodland direct.
The reason not to use it with gas logs is if you light a fire you will not see any smoke building up in your house if its closed.
With a wood fire you would be alerted that the damper is closed by the smoke.
Just common sense open damper then light fire.

If the gas logs have a standing pilot the damper needs to.be cracked open as well