Hello two problems arise: 1) absolutely must be 1.75m + arms raised to reach 3 m 2) he wrote that there was a trap door uap and although there is no more amazon told me he would investigate and that the product would block time to the investigation which is false because to date there have always sell and they still do not correct the problem for the hatch uap and still not stipulated that he had to make a special size. purchased the product 29.11.2014