{"product_id":"gas-heat-and-combustion-from-ignition-to-exhaust","title":"Gas Heat and Combustion — From Ignition to Exhaust","description":"\u003cp\u003eEverything a service technician needs to know about gas-fired heating equipment. Covers natural gas and LP properties, ignition sequences (standing pilot, intermittent pilot, hot surface, direct spark), flame sensing, heat exchangers, venting categories, combustion analysis and CO safety — each topic explained with the why, not just the how.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGas properties, manifold pressure and orifice sizing\u003c\/li\u003e\n\u003cli\u003eIgnition sequences: what fires when and what proves it\u003c\/li\u003e\n\u003cli\u003eFlame sensing: microamps, flame rectification, troubleshooting\u003c\/li\u003e\n\u003cli\u003eHeat exchangers: visual inspection, combustion analysis, when to condemn\u003c\/li\u003e\n\u003cli\u003eVenting: categories I–IV, common vent tables, condensing furnaces\u003c\/li\u003e\n\u003cli\u003eCO safety: testing, thresholds and the 400+ annual deaths the CDC reports\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWritten for the technician standing in front of the furnace.\u003c\/p\u003e","brand":"HVAC Resource","offers":[{"title":"Default","offer_id":68022335832166,"sku":null,"price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/4347\/0438\/files\/hvacr-pb-gas.jpg?v=1794399805","url":"https:\/\/hvacresource.us\/products\/gas-heat-and-combustion-from-ignition-to-exhaust","provider":"hvacresource","version":"1.0","type":"link"}