Assessments - 3, GPA: 4
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Directvent draws combustion air from the outdoors and vents to the outdoors. Example: Gas water heater 40,000 Btu/hr Vent Free Heater + 20,000 Btu/hr Total =60,000 Btu/hr 4. Compare the maximum Btu/hr the space can support with the actual amount of Btu/hr used. Example: 51,800 Btu/hr (maximum Btu/hr the space can support) 60,000 Btu/hr (Actual amount of Btu/hr used) The space in the above example is a confined space because the actual Btu/hr used is more than the maximum Btu/hr the space can support. You must provide additional fresh air. Your options are as follows: A. Rework worksheet, and the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoining room or add ventilation grills between the rooms. See Ventilation Air From Inside Building (Fig. 2) B. Vent room directly to the outdoors. See Ventilation Air From Outdoors (Fig. 3). C. Install a lower Btu/hr heater if lower Btu/hr size makes room unconfined. If actual Btu/hr used is less than the maximum Btu/ hr the space can support, the space is an unconfined space. You will need no additional fresh air ventilation. VENTILATION AIR Ventilation from Inside Building This fresh air would come from an adjoining unconfined space. When ventilation to an adjoining unconfined space, you must provide two permanent openings: one within 12” of the ceiling and one within 12” of the floor on the wall connecting the two spaces (see options 1 & 2 of figure 2). You can also remove door into adjoining room (see option3, fig 2). Follow the National Fuel Gas Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for Combustion and Ventilation for required size of ventilation grills or ducts. WARNING: Rework worksheet, adding the space of the adjoining unconfined space. The combined space must have enough fresh air to supply all appliance in both spaces.Ventilation from Outdoors If necessary provide extra fresh air by using ventilation grills or ducts. Connect these items directly to the outdoors or spaces open to the outdoors. These include Ventilation Gills into Adjoining Room - Option 1 Ventilation Gills into Adjoining Room - Option 2 12” 12” Or remove door into Adjoining Room - Option 3 INLET AIR OUTLET AIR VENTILATION CRAWL SPACE TO CRAWL SPACE TO ATTIC VENTILATION AIR VENTILATED ATTIC OUTLET AIR Figure 2 Figure 3. WARNING: A qualified service person must install heater. Follow all local codes. CHECK GAS TYPE Use only LP-gas. If your gas supply is not LP-gas, do not install heater. Call dealer where you bought heater for proper type heater. THIS INSTALLATION REQUIRES: Before installing heater, make sure you have the items listed below: • Piping (check local codes) • Sealant (resistant to LP_Gas) • Equipment shutoff valve* • Ground joint union • Test gauge connection* • Sediment trap • Tee joint • Pipe wrench *A CSA/AGA certified equipment shutoff valve with 1/8” NPT tap is an acceptable alternative to test gauge connection. Pur...
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