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Abrasion (mechanical) Abrasion is the process of scuffing, scratching, wearing down, marring, or rubbing away. It can be intentionally imposed in a controlled process using an abrasive. Abrasion can be an undesirable effect of exposure to normal use or exposure to the elements.
Those numbers are higher than they were last year, when Home Advisor put the average cost to build a house in the U.S. at $293,542. They also don’t include the cost of land. Anecdotally, we’re ...
1 /12. If you work in an air-conditioned building with poor ventilation, it can raise your risk of “sick building syndrome.”. Symptoms include headaches, dry cough, dizziness and nausea ...
DOAS air handling unit with heat recovery wheel and passive dehumidification. A dedicated outdoor air system (DOAS) is a type of heating, ventilation and air-conditioning system that consists of two parallel systems: a dedicated system for delivering outdoor air ventilation that handles both the latent and sensible loads of conditioning the ventilation air, and a parallel system to handle the ...
Glossary of HVAC terms. HVAC (heating, ventilation, and air conditioning) is a major sub discipline of mechanical engineering. The goal of HVAC design is to balance indoor environmental comfort with other factors such as installation cost, ease of maintenance, and energy efficiency. The discipline of HVAC includes a large number of specialized ...
Biological contamination can cause allergic reactions, including hypersensitivity pneumonitis, allergic rhinitis, and asthma. In large buildings, toxins released by microorganisms that live in the ...
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