<p><strong>Level 4( as per ventilation readings 12.08.18)</strong></p><p>&nbsp;</p><p>1No cubicle in the female WC reading 0 flow rate&nbsp; - disc valve to be provided to achieve the minimum building regs requirement of 6 l/s. This extract flow rate is to be drawn from the floor total and not the riser.</p><p>Male total supply flow rate addition is greater then the total extract flow rates addition. Supply grille down the corridor in the female WC to open slightly and the supply grille down the corridor in the male WC to close slightly so that total supply flow rates in the male WC is reduced by 15 l/s and the total supply flow rates in the female WC is increase by 15 l/s. Is it considered that this adjustment can be undertaken from the strings visible from the supply grilles installed over the mirrors connected to the vcds.</p><p>&nbsp;</p><p><strong>Level 3 ( as per ventilation readings 01.09.18)</strong></p><p>1No cubicle in the male WC reading 0 flow rate&nbsp; - disc valve to be provided to achieve the minimum building regs requirement of 6 l/s. This extract flow rate is to be drawn from the floor total and not the riser.</p><p>Female are total of extract grilles flow rates is less that the total of supply grilles flow rates. Extract to be provided to 1 cubicle reported as 1 l/f flow rate. Supply air flow rates to reduce so that the total of extract grilles flow rates is greater than the total of the supply grilles flow rates. Is it considered that this adjustment can be undertaken from the strings visible from the supply grilles installed over the mirrors connected to the vcds.</p><p>&nbsp;</p><p><strong>Level 2 ( as per ventilation readings 15.09.18)</strong></p><p>Satisfactory flow rates on all cubicles</p><p>Total of supply grilles, both male and female, is greater than the total of extract grilles. Where access is provided extract flow rates to increase so that total air flow of extract grilles is greater than the total of supply grilles without affecting the current floor total. If one new disc valve per WC area is required to achieve this requirement, one new extra disc valve to be provided.&nbsp;</p><p>&nbsp;</p><p>Other notes:</p><p>A big difference of flow rate readings at the main duct branch traverse points have been provided pre and post works.</p><p>There is a big discrepancy of the main duct branch readings taken at the traverse point and the addition of flow rate readings at each grilles.</p><p>&nbsp;</p><p>Main requirements to achieve satisfactory ventilation flow rate results:</p><p>A minimum of 6l/s as per build reg minimum per appliance to be provided at each cubicle</p><p>Total of grilles extract flow rate reading in each area to be greater than the total of the supply grilles flow rate readings.</p><p>&nbsp;</p><p>Access to balancing dampers shall be via existing access hatches where possible and the minimum quantity possible of new access hatches ( these will be the picture frame type with budget locks and to be left in situ on completion of works, we envisage 8 nr to be installed)&nbsp;to be provided where required.</p><p>Ventilation readings shall be submitted upon completion of final commissioning works.</p><p><strong>On top of all the above works we will recommend blanking off the 2 no builders works to plenums to improve air flow.</strong></p><p>&nbsp;</p><p><strong>Our total cost to carry out the above works out of normal working hours shall be &pound;9,034.50+VAT</strong></p><p>Breakdown</p><p>Mechanical Labour&nbsp;- &pound;3,420.00</p><p>Builders Labour&nbsp;-&pound;2,280.00</p><p>Builders Materials - &pound;1575.00</p><p>Mechanical Materials - &pound;284.50</p><p>Waste - &pound;125.00</p><p>Access equipment - &pound;600.00&nbsp;</p><p>Commissioning ( 1 nr weekend only) - &pound;750.00</p><p>&nbsp;</p>