(1) All internal combustion engines must be equipped with an approved and effective spark-arresting system, as established in the national wildfire coordinating group's Spark Arrester Guides. Spark-arresting devices must be marked, properly installed, and maintained in accordance with the Guides. The following vehicles are exempt:

(a) automobiles and light trucks of less than 23,000 GVW when all exhaust gases pass through a properly installed and maintained exhaust system, baffle-type muffler, and tailpipe. Vehicles with glass-pack mufflers do not qualify for the exemption;

(b) heavy-duty trucks of 23,000 GVW or greater, with a muffler and vertical stack exhaust system extending above the cab; and

(c) vehicles with other spark-arresting systems providing equal or increased effectiveness. Such vehicles must be inspected and have written authorization from the recognized fire protection agency.

(2) Equipment used for commercial, ranching, or industrial activities must meet the fire extinguisher and tool requirements listed in ARM 36.10.130(5) .