Stuv Outside Air Inlet En

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  DIRECT OUTSIDE aIR INLET UNDER THE STOVE : USEFUL OR NOT ? 450m 3 34,2m 3 450m 3 400m 3 The previous genertion did not sk themselves s mny questions s uswhen it comes to instlling  stove. Tody, ctors such s the ir-tightnesso the house nd the mngement o ir ows hve to be tken into ccount.How do we mke the right choices ? Under which circumstnces is the use on ir inlet useul or even indispensble ? Consumption of room air per hour (34.2 m 3 /h) by a Stûv 21/75 SF witha glass door in a home of 450 m 3 .Consumption of room air per hour by a small kitchen hood in a home of 450 m 3 . WHERE DOES THE PROBLEM COME FROM ? It’s quite simple : ã on one hand, stoves consume air for combustion,ã on the other, houses are increasingly airtight (in order to save energy).This would seem to present a major obstacle. However, once you haveunderstood these two mechanisms, it becomes much easier to nd anappropriate solution for each situation. HOW MUCH aIR DOES THE STOVE CONSUME ? A stove operating in closed-door mode consumes between 20 and50 m 3 of air an hour*. To give you an indication of what that means, theexample below shows a “normal” home, the volume of which is around450 m 3 . Proportionally, the quantity of air consumed is relatively low.By comparison, a small kitchen hood alone consumes at least 400 m 3 ofair an hour. That is certainly much more than wood-burning systems !However, don’t forget that  stove operting in open-fre mode cnconsume up to 10 times more ir thn in closed mode ! That's almost asmuch as a kitchen hood ! This factor has to be taken into consideration ! THE aIR-TIGHTNESS OF HOMES. In  trditionl home : This case is the simplest. These homes are not very air-tight because air inltrates through gaps (door thresholds and window frames), thereforethe air required for good combustion is never in short supply becauseit circulates and is constantly renewed. This renewed air ow has evenbeen quantied. It is estimated that the volume of air in the home isrenewed 5 to 6 times an hour. With buildings over 15 years old, that canreach 15 times the volume of the house per hour ! >> Solution : Any type of stove can be installed in such homes and canbe operated in open-re mode without fear of backdraught. The rate ofair renewal is sufciently high and no external air inlet is required. Energy-efcient home : The air renewal rate is around 1 time the volume per hour. This volume ofair is sufcient to ensure comfortable conditions and to allow the stoveto operate in closed-door mode. However, if the system allows open-reoperation, the home’s room air will not be sufcient for this. >> Solution : Any type of wood-burning system can be installed. Pleasenote : if it is a system allowing open-re operation, outside air inlets haveto be tted close to the stove. This will enable the increased air require-ment to be met for open-re operation. Once the re is out, these air inlets can be closed using valves to minimize heat loss from the home. * Consumption table available at stuv.com > downloads > standards and efciency  The Stûv 21 is compatible withmost homes, even energy-efcienthomes. In the case of the latter,an adequate outside air inlet has tobe positioned under the stove, equippedwith valves to ensure a greater inow of air when it is operating in open-re mode.It is only prohibited in a passive house where only stovesequipped with a completely air-tight air-feed system canensure smooth operation without disturbing the air condi-tions in the home. It is also too powerful for such houses.   For  pssive house : The house is very air-tight. The air renewal rate is completely control-led by mechanical ventilation systems. These enable renewal of 60% ofthe home’s air volume per hour. This is the minimum air renewal rate toenable residents to breathe and to maintain healthy conditions withinthe home. The presence of another system that consumes room air dis-turbs this balance. >> Solution : rather than rarefy room air, the air for combustion has tobe drawn from outside using an independent connection. This optionis only feasible on systems equipped with an outside air inlet directlyconnected to the combustion chamber. The “open-re” mode is used aslittle as possible to prevent backdraught. a - Nturl ventiltionB - Propulsion systemC - Extrction systemD - Dul-ow systemPssive house( < 15kW/h per m 2 )* Please note that housesare pressurized.Ensure sufcient air intake.Be aware of kitchen hoods.Stûv 16-in , Stûv 16-cube,Stûv 16-H, Stûv 30-up,Stûv 30-compact,Stûv 30-compact H Energy-efcient house( < 30kW/h per m 2 )* All Stûv stoves are compatible with energy-efcient and traditional homes. Trditionl houseStûv 16-in, Stûv 16-cube, Stûv 16-H, Stûv 21, Stûv 30, Stûv 30-in, Stûv -30-up,Stûv 30-compct, Stûv 30-compct H, Stûv 60 * This is the energy requirement for heating and cooling the building  Not applicable Not applicable    D E  S T û V  2 1  I S COM Pa T I BL E  W I T H  EN E RG y-  E F F IC I EN T  HOM E S  November 2010   ❘   Stûv sa   ❘   rue Jules Borbouse, 4   ❘   B-5170 Bois-de-Villers   ❘   Belgium   ❘   info @ stuv.com   ❘   www.stuv.com Edited by : Gérard PitanceThis non-contractual information sheet is intended for information purposes only.