Accessories (optional) - Marine Office

Accessories: Air SystemFunctioning Principals1.Minimum air grille sections To obtain acceptable noise levels at maximal blower speed minimumrequirements for grille and ducts sections should be observed. The size of the transition box behind the supplyair-grille is also important.Air HandlerWBCC ModelSupply Air GrilleModel / section cm 2Return Air GrilleModel / section cm 2Duct diam.< 2m duct ength4,000 / 4,500 BTU 1 x 8x4’’ 150 cm 2 1 x 12x5’’ 325 cm 2 80 mm 100 mm6,000 BTU 1 x 10x4’’ 190 cm 2 1 x 11x8’’ 490 cm 2 100 mm 125 mm9,000 BTU 1 x 12x4’’ 235 cm 2 1 x 11x8’’ 490 cm 2 100 mm 125 mm12,000 BTU 1 x 10x5’’ 250 cm 2 1 x 14x7’’ 550 cm 2 125 mm 150 mm16,000 BTU 1 x 12x6’’ 390 cm 2 1 x 14x10’’ 800 cm 2 125 mm 150 mmor 16,000 BTU 2 x 10x4’’ 380 cm 2 125 mm 150 mm20,000 BTU 1 x 12x6’’ 390 cm 2 1 x 14x10’’ 800 cm 2 125 mm 150 mmDuct diam.> 2m duct length24,000 BTU 2 x 10x5’’ 500 cm 2 1 x 14x12’’ 1000 cm 2 2 x 125 mm 2 x 150 mm30,000 BTU 2 x 12x5’’ 650 cm 2 2 x 14x10’’ 1600 cm 2 2 x 125 mm 2 x 150 mm48,000 BTU 4 x 10x5’’ 1000cm² 2 x 14x12’’ 2000cm² 2 x 125 mm 2 x 150 mm2.3.4.5.Blower Outlets 90° turns with flexible ducts directly from blower outlets should be avoided at all costs asthey introduce severe restrictions in the air-flow. All WB blowers (except on 24.000 BTU models) can be rotatedthrough 45° steps to obtain a straight-line outlet from the blower. This facility should be used whenever possible.Return grille offset It should be avoided to place a return air grille directly opposite the finned coil surface ofan air-handler, because this will allow propagation of direct blower-motor noise through the grille. The grille shouldbe offsetted to chicane the return air to the coil inlet. Direct noise propagation will be reduced in a significant manner.Duct type To avoid accidental crushing, flexible air-ducts should be of high quality with sufficiently strong steelspiral reinforcement. Spiral type ducts should be extended to their maximum length for the best interior smoothness.For very long duct sections smooth bore ducts (in PVC for example) should be preferred. This offers better smoothnessthan flexible spiral type ducting and hence reduces internal friction. For very short lengths non-insulated ducts can beused. For greater lengths it is advisable to use insulated type ducts to avoid condensation on the outside of the airducts.Big luxury yacht In general requirements for megayachts and big luxury vessels are even more stringent thanthe table here-above. These special requirements can be obtained from Webasto on request.In order to customize the wooden air grilles at page 101,please choose from the following wood options:Example: WBCL0040040 = Teak Air Grille 12 x 5 WBCL0040042 = Mahogany Air Grille 12 x 5Suffix Wood Type Decription Suffix Wood Type Decription0 Teak Asian Teak 7 Maple American soft Maple1 Cherry American Cherry 8 Beech American Beech2 Mahogany Honduran Mahogany 9 Cedar Spanish Cedar3 Ash American white Ash 10 Makore African Cherry4 Oak American white Oak 11 Hickory American Hickory5 Walnut American black Walnut 12 Jatoba Brazilian Jatoba6 Poplar American PoplarNote: Teak versions on stock. Other wood options may have longer lead times or extra shipping costs.100