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| Easy to work we use it to make ventilation boxes or natural ventilation shafts. Polyboard resists to the wet and corrosive drafts. Taken photo from Člevage Ménard St-Joachim de Courval Qc. |
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| Easy to work we use it to make ventilation boxes or natural ventilation shafts. Polyboard resists to the wet and corrosive drafts. Taken photo from Člevage Ménard St-Joachim de Courval Qc. |