I am getting a VF3000 and need to put it close to a combustable wall. The specs say 18" away but I read that if I mount sheet medal on the combustable wall with 1"spacing off the floor and 1"spacing off the wall I can cut down the space requirement by 66% which would be 6". from other info it can be cut down to 9". I checked home depot and they have 2ftx3ft sheets for $7 each. I could cover the wall with those sheets using 1"long 1/2" copper pipe for spacers.
Does any one know where I can get larger pieces of sheet medal? any better ideas on spacers?
Any sheet metal shops in your area? They stock galvanized steel in large sheets. If you want aluminum, try a window out fit, or for painted aluminum, a sign shop. 4' by 8' .04" white aluminum from a sign shop should retail around $100. Much less for galvanized from a sheet metal place.
Sheet metal shops typically have 4' x 10' sheets of galvanized sheet in various guages and will cut it to size for you. Cement board spaced out 1' on metal spacers will provide comparable protection. Check with your local code authority/insurance agent to confirm whatever approach you decide on is acceptable in your location.