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Dear Protech.
Thank you for supplying 3 secondary glazing units.
I ordered them on a Saturday and received them in excellent condition via a very friendly driver within three days.
They were easy to fit with minimal skill level required.
The quality is excellent, sound levels are reduced by 80% and thermal insulation is very good in summer, (keeps the inside cool) so I expect good results in winter.
I have no hesitation in recommending your product.
Kindest regards

Steve Law