1592953269000 1312632483000 term-41779 1752516552105 1752497431000 1752516470966 adlib fitz-online adlib-term-41779 b224c876-ca29-3be9-b9b0-bd7ced19e534 3 1 scope note Central warm-air heating systems through which air is circulated by gravity. ACME V.PC.ALO.AFU.AXC.ARI.BIQ.ALO 1 code V.PC.ALO.AFU.AXC.ARI.BIQ.ALO 1 gravity heating reference term-41789 adlib-term-41789 a8cdf9d3-db8f-3685-af5a-26d844039b32 warm air heating gravity heating term