<ul><li>Undertake survey to ventilation units. Units were found to be in working order but unused for a while.</li><li>Attending engineer cleaned all filters whilst on site.</li><li>Units ran with no issues.&nbsp;</li></ul><p><strong>Breakdown</strong></p><p>Labour: &pound;155.03</p><p>Materails: &pound;20.00</p><p>Our total cost to carry out the above works in normal working hours shall be</p>