Inquiry (采购产品): flane arrestor We have a 4" duct leading away from an electric blower. The blower is drawing air through an electric heater. If there is a wire short the blower draws the sparks up through into the duct causing fire. **** Hidden Message ***** greg dosenberg VoN 2S0 Company: howe sound pulp & paper E-mail: greg.dosenberg@hspp.ca **** Hidden Message ***** greg.dosenberg@hspp.ca