What size is the fan that needs to be replaced?
Someone once PM'd me about options for a range fan, and I recommended either the silverstone AP182, or the FM181.
both are 180MM fans, both come with speed controllers built in, so one can twist a dial to change rpm.
The AP182 goes to 2000 rpm and moves lot of air, the FM181 cfm rating is not much less, despite only 1300 rpm max.
My AP182 did nto like battery charging voltages, had to limit it to 12v or less or the hub would get too hot at max speed. This is the only 12v fan I have owned and used which had issues with battery charging voltages, even those that claimed a 13.5v max, have have no issues with 16.2v.
My fm181 replacement has no issues all day long at 14.7v and max speed. The person who PM'd me chose to install the FM181 and pm'd me back how quiet it was and how well it worked.
I recommend peeling back the sticker on the hub and globbing some dielectric grease where the wires solder to the circuit board. I use Amazing goop for this. If nothing is done green corrosion will break the wire at this solder joint, although the greases from cooking will likely inhibit that occurrence. My fans which have failed from corrosion here have almost exclusively been intake fans sucking in damp salty air.
I have computer fans that are used exhaust fans that see cooking fumes. They have not had issues with corrosion or the cooking fumes, but cleaning their oily dusty covered blades can be tediously time consuming with 3 qtips at a time dipped in rubbing alcohol.
Computer fans come in many sizes, 120Mm is the most common but 140mm, along with 180 200 and 230 are also available as well as smaller sizes,92 , 80, 70, 60 and 40mm being popular sizes with many options to choose from.
Noctua has some industrial computer fans that are IP67 rated, but the 12v models are only 2000 rpm, the 3k rpm IP67 rated fans are 24v.
I still covered the wire entry of my IP52 rated noctua industrial fans with Amazing goop. I have the NF-f12 3k rpm industrial and the 3k rpm 140mm fan, on the Noctua NA-FC1 PWm speed controller for use on 4 wire PWM computer fans.
If one puts a computer fan on a PWM speed controller, they should seek a pwm motor speed controller of more than 21kHZ or it will make an annoying Audible whine at lowered speeds.
I control several fans through voltage buckers. No whine, but they lose a nearly a volt on the top end for less top speed, but I usually have at least 13.6v available to feed them so 12.6v reaching the fan through the bucker is still over the 12v even where the fan ratings are collected.
One 30v rated fan I own (not a computer fan but about 6.5 inch diameter, 2 inches thick), is speed controlled through a voltage buck/booster. Works from 7.46v where it draws 0.09 amps, to 33V where it draws 3 amps. Even at 12.8v(0.51 amps) this fan moves in the 165CFm range, which is likely far more than the range hood fan.
The engineering that goes into many computer fans is impressive. One will never look at a flat angled fan blade in the same way again, when one has seen the beauty of the foils on some of the impellers on these computer fans.
