We produce various size dustproof filter guard for ventilate fan.
The main outsize is (Length*High*Thickness)
105mm*105mm*4.0mm
250mm*250mm*6.0mm
325mm*325mm*6.0mm
148.5mm*148.5mm*13.5mm
204mm*204mm*13.5mm
255mm*255mm*13.5mm
320mm*320mm*13.5mm
420mm*180mm*13.5mm
205mm*221mm*25mm

The special size can custom by vendors, also, we offer best price with the high quality to our customers.