Mr Heater install

[al704]

Installing a 50000btu nat gas Mr Heater. Garage ceiling is OSB, what do I use where the class B vent penetrates the ceiling. The Mr heater vent kit includes a wall thimble is this also correct for ceiling?

 

[Marv's Shop]

This is what I used to run my b vent through the ceiling.

http://www.menards.com/main/heating...-class-b-support-assembly/p-1444432077420.htm

Gives you your 1" clearance for combustibles.