Hello,
I recently decommissioned the gas central heating system in my house, so I now have a hole in the cupboard where the return duct used to be. I was wondering what wood material I should use to cover the hole (i.e. plywood, MDF etc.)? and what thickness to go for. Given it's inside the cupboard and it doesn't need to match the rest of the flooring, the intention was to place a board over the top of the hole (approx. 395mm x 355mm) and use liquid nails/screws to secure it in place. I did buy MDF already to fill the hole, but I'm not sure if it's okay to use long term, given it would be exposed to the air in the crawlspace on the bottom.
I'm also wondering where I could get replacement floorboards to cover the holes from the registers/heating outlets? In this case I would like to cut out some of the existing floorboard and replace sections with new floorboards that closely match with the existing floorboards.
Any help would be appreciated!
