(b)(4).We received two mr290 chambers for investigation: the complaint chamber plus an unused, sealed chamber.Lot number manufacture date 120606 6 june 2012.140408 8 april 2014.Method: the mr290 chambers were visually inspected.Result: visual inspection revealed no damage to the two returned chambers.Conclusion: we were unable to determine what caused the problem reported by the customer as no fault was found with the returned complaint chamber.Every mr290 chamber is pressure tested following the manufacturing process to check for any leaks present in the chamber due to cracks and other causes.Any chamber which fails this test is rejected.In addition, the pressure test is followed by a visual inspection of each chamber.The user instructions that accompany the mr290v chamber state the following: - maximum operating pressure: 8 kpa - use of the mr290 above the maximum operating pressure may lead to cracking, water leakage and, on rare occasions could lead to a loss of ventilation pressure.- do not soak, wash, sterilize, or reuse this product.Avoid contact with chemicals, cleaning agents, or hand sanitizers.
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