My Avalon Astoria manual states:
Floor Protection Requirements
• The heater must be installed on a non-combustible floor protector extending the full width
and depth of the heater and extending 6" in front (minimum 27-3/4" wide by 31" deep)
(minimum .018" thick - 26 gauge) .
• Must extend under and 2" to each side and rear of a "Tee" (if used).
Smokey you are correct in what your Sarnac manual states!
Page 15 Step 2 see > >
http://www.hudsonriverstoves.com/pdf/saranac.pdf
2. Install a non-combustible hearth pad underneath the unit. This pad should extend
at least 6” (152 mm) in front of the unit.