In winter, the northern cold areas generally like to seal the doors and windows, because it will be a little warmer indoors, so, what aspects need to pay attention to in winter doors and windows sealing work?  

The surface of the alminium window profiles is not smooth: the aluminum alloy doors and windows are easy to leak, the main reason for the air leakage of aluminum alloy doors and windows is the closeness between the aluminum alloy doors and windows fan and frame, the flatness of the profile is an important factor affecting the closeness.  If the profile flatness is not enough or deformation, it is easy to make aluminum alloy doors and windows between the fan and the frame gap, resulting in air leakage phenomenon.