A breakdown hoist is located in a timber processing operation between a direct-fired ash-producing combustor for generating the heated gas stream for kilning a pile of lumber and the feed for a downstream operation such as sorting, grading, trimming and/or packaging, with or without planing. At the hoist, the kilned lumber is progressively destacked in a tilting, sliding and tumbling operation which results in the shunting-aside of spacer sticks, and conversion of the pile into a single layer of lumber progressing along on a feeding deck toward the downstream operation. A fog cloud of water droplets is sprayed obliquely downwards towards downstream from about 3 to about 9 feet above where the breakdown hoist adjoins the upstream end of the feeding deck, at approximately parallel to the top course on the pile. The fog cloud spreads out to envelope the feeding deck. As the kilned lumber tumbles from the top of the pile and ash particles are shaken off and become airborne, they become wetted by water droplets from the fog cloud and settle to the floor.
At the breakdown hoist located in a timber processing operation, between a direct-fired ash-producing combustor for generating the heated gas stream for kilning a pile of lumber and the feed for a downstream operation such as planing, at which hoist the kilned lumber is progressively destacked in a tilting, sliding and tumbling operation that results in the shunting-aside of spacer sticks and the conversion of the pile to a single layer of lumber progressing on a feeding deck toward the downstream operation, the exposed upper face of the pile is sprayed with a fog of water sufficient to wet-down the ash so that it does not become an airborne irritant. As to each course in the pile, this wetting-down is completed before that course slides or tumbles from the pile. Preferably the spraying utilizes a bank of full cone fog nozzles.