Hello,i have a Brivis ducted gas heater on the side of the house.Last year i had to remove all the ducting from under the house,because the mice got inside and rip it and crapped in it.
The problem i have now is that i didnt measure anything when i threw the duct to the tip. How crucial is it to have the correct lenghts of duct going from the main unit to the ducts throughout the house?
The model on the side of the unit says - Brivas Buffalo 85
Any help would be much appreciated!