Refrigerant distributor Greencool Technology's claims about the effectiveness of its products continue to be called into question despite its strenuous denial of media reports that cast doubt on the company's integrity. In a teleconference with local media, which followed a three-hour conference with Beijing's media, chairman Gu Chujun reasserted a claim made in the company's listing prospectus that four of its refrigerants had received designations from the American Society of Heating, Refrigerating and Air-conditioning Engineers (Ashrae). The products include refrigerants R405a, R411a, R411b and R411c, named according to Ashrae's coding system. Ashrae provides standard designations and safety classifications to refrigerants but they are not a prerequisite for commercial sale. Mr Gu said Greencool, which is listed on the Growth Enterprise Market, had reports published by Ashrae which backed up its claim. But Greencool's claim contradicts an e-mail sent last Friday from United States-based engineering consultant Jim Calm, who sits on Ashrae's committee for awarding designation and safety classifications. Mr Calm was asked by Ashrae public relations manager Jodi Dunlop to reply to a Business Post query. 'Ashrae has not assigned a designation of R411c thus far, as may be verified in [Ashrae's standard 34] and published addenda thereto,' Mr Calm wrote, adding the associated safety classification had also not been approved. He said the designation application, lodged in about 1996, met with two comments - both submitted by him - in a public review which stalled its progress. One was subsequently resolved on condition of a caveat on the suitability of the refrigerant for particular applications. The other is still pending submission by Greencool of a required safety analysis. Mr Calm said he was commenting in a personal capacity and not on behalf of Ashrae. Ms Dunlop said last night she was not sure if Ashrae would give an official comment, given Mr Calm was considered the best person to answer the question. When pressed for evidence to attest to Ashrae's approval claimed by Greencool, vice-chairman Hu Xiaohui produced an Ashrae standard 15 report, in which R411c was mentioned. Mr Hu later admitted that R411c did not receive approval on Ashrae's standard 34, but said he did not know why. He refused to explain to journalists what standard 15 and 34 meant. Ms Jodi said standard 15 - Designation and Safety Classification of Refrigerants - establishes procedures for operating equipment and systems to assure the safety of building occupants and system technicians. Standard 34 - Safety Code for Mechanical Refrigeration - includes toxicity and flammability safety classifications for refrigerants. Mr Calm said R405a's safety classification was deleted based on new information on the toxicity of one of its components, adding it was possible it would be reassigned but he believed a new application would be required. Mr Gu said he believed R405a's safety classification would be reinstated upon the submission of certain information.