Assessments - 4, GPA: 4
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This can be achieved by ensuring that the hearth is constructed and sized in accordance with the guidelines included in section 2 of approved document ‘J’. The size and clearances of the hearth are as follows: The constructed hearth should be constructed in accordance with the recommendations in document J, and should be of minimum width 840 mm and minimum depth 840 mm (if a free standing hearth b) above) or a minimum projection of 150 mm from the jamb (if a recessed hearth a) above). Costructional Hearth Dimensions as below At least 300 mm At least 150 mm or to a suitable heat resistant wall At least 150 mm Hearth Surface Free of Combustible Material Perimeter should be clearly marked e.g. edge of superimposed hearth Perimeter should be clearly marked e.g. edge of superimposed hearth Appliance Doors Appliance Doors ST912 Fig. 10 Noncombustible hearth surface dimensions. a) Fireplace recess b) Free standing dealer or your local building inspector can provide details of other approved methods of passing a chimney connector through a combustible wall. DO NOT CONNECT THE HEATER TO ANY AIR DISTRIBUTION DUCT OR SYSTEM. 9 Dutchwest Non-Catalytic Convection Heater 30003849 Fireplace Installations The Dutchwest Model 2477CE has a reversible flue collar to allow for either top exit or rear exit installations. You may install your Dutchwest Model 2477CE in an existing fireplace as a fireplace insert with no legs, or with the standard legs attached. To install the heater without legs as a fireplace insert, the floor must be completely noncombustible, such as an unpainted concrete floor over earth. Many fireplaces do not satisfy the “completely noncombustible” requirement because the brick or concrete hearth in front of the fireplace opening usually is supported by heavy wooden framing as in Figure 11. Because heat passes readily through brick or concrete, it can easily pass through to the wood. As a result, such fireplace hearths are considered a combustible floor. You may not install a heater on a combustible hearth without legs. Standard leg installations must include the bottom heat shield. The floor protector must also meet standard requirements for freestanding installations. ST799 Fig. 11 Combustible supporting timbers (A) may lie beneath fireplace hearths; such situations require additional floor protection. A ST799 combustible support timbers 5/04 Floor Protection for Fireplace Installations Fireplace installations with the standard legs and the bottom heat shield must have a floor protector of the same construction as that specified for freestanding installations. The floor protector must extend at least 406 mm (16”) from the front of the stove and from the left (loading door) side, and at least 152 mm (6”) from the right side and rear. It must also provide protection beneath any horizontal runs of the chimney connector, including 51 mm (2”) to either side. Many raised hearths will extend less than the required distance from the front of the heater when it is installed. In such cases, sufficient floor protection, as described above, must be added to extend the hearth 406 mm (16”). Fig. 12 Extra floor protection may be required for the fireplace hearth, even if your stove is installed with the legs and the bottom heat shieSlTd8.09.. stove n fireplace 5/04 ST809 Hearth rugs do not satisfy the requirements for floor protection. Fireplace insert installations also have specific clearance requirements to the side walls, side decorative trim, and fireplace mantel. This information is found in “Fireplace Installation Clearances” in this section. REMINDER- FIREPLACE INSERT INSTALLATIONS WITHOUT LEGS ARE PERMISSIBLE ONLY IF THE HEARTH IS COMPLETELY NONCOMBUSTIBLE, SUCH AS UNPAINTED CONCRETE OVER EARTH. Keep the Stove a Safe Distance From Surrounding Materials Both a stove and its chimney connector radiate heat in all directions when operating. A safe installation requires that adequate clearance be maintained between the stove and nearby combustible materials to ensure that such materials do not overheat. Clearance is the distance between either your stove or chimney connector, and nearby walls, floors, the ceiling, and any other fixed combustible surface. Keep furnishings and other combustible materials away from the stove as well. In general, a distance of 1219 mm (48”) must be maintained between the stove and moveable combustible items such as drying clothes, furniture, newspapers, firewood, etc. Keeping those clearance areas empty assures that nearby surfaces and objects will not overheat. Dutchwest Non-Catalytic Convection Heater Clearances As with any solid fuel heating stove, extremely high surface temperatures can occur, particularly in the event of uncontrolled operation, e.g. if the doors are inadvertently left open. It is crucial that sufficient clearances are allowed to any combustible surfaces, e.g. wooden mantels or lintels, and to timber framed (studded) walls even if they are faced with noncombustible ...