Insulated generator quiet box part 1

Insulated gen box for northern climates .
Directly wired to house breaker panel.
Advantageous in as far as selecting whatever circuits
you want on and/or off in order not to exceed gen watt rating.
100 watt light bulb keeps interior above freezing,
as low as -4 Fahrenheit / -20 Celsius outside temp.
2 x 825 cfm + 1 x 680 cfm exhaust fans for a total of 2330 cfm.
1-1/2" R-6 ComfortBoard™ Insulated Sheathing Board
for walls and doors, R-12 pink fiberglass insulation in floor and roof.
all lined with reflective vapor barrier.
Interior of box runs @ 95 ºF with 85 ºF outside temp.
standard car muffler eliminates low muffler thumping
on original gen muffler which travels thru the ground
and resonates inside the house.
Sound level inside house is 1/4 that of standard lawnmower.
gen = $ 1.000, box / muffler / fans and hardware = $ 1.000