Some key safety standards and recommendations for dryer vent installation include:

• First,dryer vent installation must terminate outside the building envelope. Dryer exhaust must vent to the outside, not into crawl spaces.Exterior vents prevent fire hazard and health risks.

• In addition,max vent length of 25-35 feet (depending on dryer type). As vent length increases, more effort is required to move exhaust air which reduces efficiency and can increase the risk of damage or blockages developing. Short vent runs are preferable when possible.

• Also,45-90 degree elbows must be metal or vinyl. These materials can handle the high heat of dryer exhaust without melting or warping. Elbows should be properly sealed/secured to prevent air leaks.

• Moreover,vents must slope slightly upward as they run. Vents that slope downward can allow lint and moisture to clog the pipe by trapping these inside. An upward slope helps airflow and prevents buildup.

• Furthermore,secure, support and brace ducts to avoid swaying or sagging. Caulk, clamps, zip ties, hangers or straps should be used to support vent pipe and prevent movement which can lead to kinks, damage and air leaks.

• Next,weatherstripping or vent dampers must seal joints and the exterior vent. These prevent rain, snow, rodents and other debris from entering the vent system which can then clog filters or damage internal components. Seals maintain efficiency and avoid safety risks.

• Also,fire prevention: metal vents, minimal bends, properly supported, minimal length, sealed connections. These attributes help reduce static buildup and prevent overheating, sparking or fire within the vent system.

• Then,consider dryer exhaust vent cleaners for high-usage homes. Homes with multiple dryers, high-volume usage or where pet hair ends up in vents benefit from vent cleaners to prevent debris buildup and fire hazard. Flexible or attachments make it easy to clean the full length of vents.

• Finally,check local building codes for any specific requirements in your area. Venting requirements may vary in different regions due to factors like average climate conditions, construction techniques used, and any additional safety considerations. Local codes ensure requirements account for the typical issues in your area.

In conclusion,proper installation of dryer vents according to all applicable standards and recommendations helps prevent risks like moisture damage, air leaks and exhaust fume re-circulation. It ensures safe, economical and trouble-free use of your dryer for its full lifespan. Be sure to have vents installed by a professional for the best results. Does this cover the key points you wanted to know about dryer vent installation standards and recommendations? Let me know if you have any other questions.