NC 96 CW_ARCHITECTURAL

8 Technical & commercial information NC 96 CW 2018/01 Maintenance of aluminum windows 72 - INFORMATION - 007 Your new METRA windows ensure high performances of air and water tightness required by the specific Standards for the energy saving. The lack of air exchange between indoor and outdoor can cautilization the increase of the rela- tive humidity ratio of which, vice-versa, in order to limit the condensation, must be kept at a normal level, operating as per figures A and B . Other possible sources of humidity in the houtili- zations could be: Water boiling, food cooking, washing, shower, indoor plants, number of persons in the rooms, etc. The humid air settles on the windows and non- porous materials (ex. glass) in form of condensation and on the walls in form of eventual moulds and stagnation stains. The condensation starts to form when the temperature of the walls in the room is lower than the temperature called “temperature of dew”. The temperature of dew is determined by the two following factors: - Relative humidity ratio inside the rooms - Temperature inside the rooms The ventilation of the rooms brings the air humidity to regular values. By a short and repeated aeration, there is a low waste of energy and an efficient exchange of air is guaranteed. The inhabiting wellbeing, as shown in the figure, is reached in function of the room temperature and of the relative humidity. Maintenance of the windows Ventilation of the rooms Apart from cleaning the profiles, it is necessary to provide for the maintenance of the weather gaskets and accessories and repair, if necessary, the damaged parts. N.B. Any eventual replacement of worn or damaged parts or adjustment must be done exclusively by qualified staff. 1- Lubricating product for hardware The opening parts and all lock points must be lubricated with oil or anti-acid grease. The spray leaves a protective film over the treated parts, improving the movement and attenuating any possible troublesome noise. 2- Product for gaskets Cleaning the gaskets by a cloth damped with the indicated product at least twice a year, will enable the gaskets to keep their correct elasticity. In case of damages due to negligence or insufficient maintenance, any possibility to appeal to the guarantee is excluded. The utilisation of a non recommended product releases METRA from the responsibility of any damage caused to the windows. B) Heating off Ventilate the rooms as per the figure for long time depending on the utilisation. A) Heating on Ventilate the rooms as per the figure more times a day for about 5 minutes. EXTERIOR TEMPERATURE RECOMMENDED MAXIMUM INTERIOR RELATIVE HUMIDITY AT AN INTERIOR TEMPERATURE OF 21°C (70°F) -29°C (-20°F) 20 % -24°C (-10°F) 25% -18°C (0°F) 30% -12°C (10°F) 35% -7°C (20°F) 40% Source: Canadian Mortgage and Housing Corporation (CMHC)