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<div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">Dear All,</div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">We have a residential project<span> </span>with hybrid heating source (gas+electric) to condition the dwelling and corridor spaces. There are few electric heaters serving stairwells and storage spaces. As per exception 'e' of section G3.1.1, ASHRAE 90.1-2010, the thermal zones designed for heating only systems in the proposed design, serving storage rooms, stairwells etc. and not exhausting or transferring air from mechanically cooled thermal zones in the proposed design shall use system 9 or 10 in the baseline building design.</div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">The query is whether the selection of system 9 or 10 is based on building heating source (hybrid in this case) or as per unit heater's heating source (electric).</div>

<br><div>Thank you.</div><div><br></div><div>Regards,</div><div><br></div><div>Mayank Bhatnagar</div><div><br></div><div>

<span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;color:rgb(0,102,0)">Senior Project Manager<br></span><b style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Environmental Design Solutions Pvt. Ltd. [EDS]</b><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">D - 1/25<span> </span></span><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Vasant Vihar</span><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">New Delhi - 110057</span><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">India</span>

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