BROAN AND NUTONE HAVE DIFFERENT "SERIES" HOODS.

 YOUR MODEL MAY SAY FOR EXAMPLE 46000.  THAT IS A SERIES OF HOOD, NOT NECESSARILY THE MODEL NUMBER. 

THE MODEL NUMBER CONSISTS OF 6 DIGITS, THE FIRST 2 BEING THE SERIES, IN THIS EXAMPLE 46.

TO FIND YOUR MODEL NUMBER YOU NEED TO KNOW THE WIDTH OF YOUR RANGE HOOD, IN THIS EXAMPLE WE WILL USE 36", MAKING YOUR SECOND 2 DIGITS 36.

THE LAST 2 DIGITS ARE THE COLORS:
01 = WHITE
02 = BISCUIT
04 = STAINLESS
08 = ALMOND
11 = WHITE ON WHITE
18 = ALMOND ON ALMOND
22 = BISCUIT ON BISCUIT
23 = BLACK

SO IF YOU HAVE A STAINLESS HOOD THAT IS 36" AND A 40000 SERIES YOUR MODEL NUMBER WOULD BE :  463604