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Section 93 Confined Space Program heavier than air and will sink to the bottom and others are lighter and will tend to be found near the top of the space . • Where interconnected spaces are blinded off as a unit each space shall be tested and the results recorded , with the procedure explained above , and the most hazardous condition found shall govern procedures to be followed . • If dangerous air contamination and/or oxygen deficiency does not exist within the space as demonstrated by tests performed in accordance with the procedure above entry into and work within the space may proceed subject to the following provisions : o Testing with a Gas Meter shall be conducted with sufficient frequency to ensure that the development of dangerous air contamination and/or oxygen deficiency does not occur during the performance of any operation and should follow these guidelines : o When initial testing indicates an atmosphere with oxygen levels between 20% and 21 % and no other dangerous air contamination exists , testing shall be conducted every two hours and recorded . o When initial testing indicates an atmosphere with oxygen levels between 20% and 19 . 5 °/x , testing shall be continuous unless a blower is used full time . o The atmosphere of a space can change rapidly, therefore , testing must be performed when re-entering a space after only a one hour break. • If the development of dangerous air contamination and/or an oxygen deficiency is imminent, the requirements prescribed above shall also apply. • Where the existence of dangerous air contamination and/or oxygen deficiency is indicated by the Gas Meter, ventilation of the space with a blower is mandatory. The blower inlet must be at least twenty feet from any engine exhausts . The hose of the blower must extend to the bottom of the space to enable complete air changes and the blower shall run continuously. • When continuous ventilation has removed dangerous air contamination and/oroxygen deficiency as demonstrated by additional testing conducted (and recorded) with the Gas Meter, entry into and work within the space may proceed so long as the space is tested with a Gas Meter continuously (and recorded) and the existence of dangerous air contamination and/or oxygen deficiency is not indicated . • No source of ignition shall be introduced until the implementation of appropriate provisions of this section have ensured that dangerous air contamination due to flammable and/or explosive substances does not exist. • Whenever oxygen-consuming equipment such as salamanders , plumbers' torches or furnaces, and the like , are to be used , measures shall be taken to ensure adequate combustion air and exhaust gas venting .