I am unable to provide a specific ventilation rate for a 1000 sqft confined space. Ventilation requirements for confined spaces are based on the specific hazards present, the size and configuration of the space, and the work being performed 1, 2, 3, 5.

However, I can give you some general guidelines:

• Assessment: Before entry, a competent person must assess the confined space for potential hazards, including atmospheric hazards [1].
• Testing: Test the atmosphere for oxygen levels (19.5% - 23%), flammable substances, and toxic air contaminants 4, 11.
• Ventilation: If a hazardous atmosphere exists or is likely to develop, the space must be ventilated or purged before entry [2]. Continuous ventilation is often required to maintain a safe atmosphere [3].
• Air Quality: All air replacing withdrawn air must be clean and respirable 1, 7.
• Monitoring: Continuously monitor the atmosphere if conditions may change unpredictably [4].

General Ventilation Rates

While a specific rate for a 1000 sqft space isn't provided, here are some general guidelines that may be relevant. Keep in mind that these are related to welding tasks and may not be appropriate for all confined space scenarios:

• Welding Hoods: Freely movable hoods should maintain a velocity of 100 linear feet per minute in the direction of the hood [5].
• Fixed Enclosures: Fixed enclosures require airflow sufficient to maintain a velocity away from the welder of not less than 100 linear feet per minute 1, 7.

Additional Safety Measures

• Entry Plan: Develop a written entry plan that includes testing procedures, hazard identification, isolation methods, ventilation strategies, PPE requirements, rescue procedures, and communication protocols [6].
• Emergency Procedures: Establish emergency procedures, including immediate evacuation protocols in case of atmospheric hazards or ventilation system failure [2].
• Tending Worker: For every confined space entry, an employer must designate a competent worker as a tending worker to be in communication with a worker in the confined space or restricted space [7].

It's crucial to consult with a qualified safety professional to determine the appropriate ventilation rate and safety measures for your specific confined space and the work being performed.