I am unable to provide a specific ventilation rate for a 1000 sqft confined space. The required ventilation depends on the specific hazards identified within the space [1]. You must adequately vent all welding and cutting operations carried on in confined spaces to prevent the accumulation of toxic materials or possible oxygen deficiency [2]. The goal of ventilation is to ensure a safe atmosphere is maintained [3]. This means maintaining oxygen levels between 19.5% and 23% and minimizing toxic, flammable, or explosive substances [3], [4], [5].

To determine the appropriate ventilation rate, a competent person should assess the hazards present or likely to be present in the confined space [1], [6]. Testing the atmosphere before entry is crucial to identify any hazards [4], [5]. Continuous monitoring may be required if conditions could change and put workers at risk [3], [4].

If a safe atmosphere cannot be achieved through ventilation alone, respiratory protective devices are required [3]. It's also important to have emergency procedures in place, including rescue plans and communication systems [7], [8], [9].