For Generac

Generac 0J8478 Standby Generator Air Filter (14–22 kW)

4.8 (138)

A replacement air element for Generac 14 to 22 kW air-cooled standby generators with the 990cc and 999cc V-twin, 2013 and later.

$16.88price at last check, Sep 27, 2026

Fits models

Generac 14 kW
16 kW
17 kW
20 kW
22 kW
Guardian
Centurion
Watchdog
Eaton
Siemens (2013 Evolution)

Replaces: 0J8478, 0J8478S

For air-cooled units from 2013 on. Older models use a different filter.

About this kit

Standby generators exercise every week and breathe whatever blows past the house. A clogged air element makes the engine run rich, fouls plugs and shortens its life. This filter replaces Generac 0J8478 and 0J8478S and fits Guardian, Centurion, Watchdog, Eaton and Siemens units built on the 2013 Evolution platform.

It measures about 9.37" by 5.43" by 1.34". We suggest changing it every year before storm season, or every 200 hours, whichever comes first.

Replaces Generac 0J8478 and 0J8478S
Fits 990cc and 999cc V-twin, 2013 and later
Guardian, Centurion, Watchdog, Eaton, Siemens
Approx. 9.37 x 5.43 x 1.34 in

In the box

1 air filter element

For machine brand	Generac
Replaces	0J8478, 0J8478S
Items in the kit	1
Kit options	1
Rating	4.8 / 5 from 138 reviews
Category	Mower, Generator & Pressure Washer Engine Parts