Nitrogen and Oxygen Gas Generator ROI Worksheet The worksheet below will help our company calculate your ROI based on your current or future nitrogen gas or oxygen gas usage. If you have any questions, please contact us at any time. We will contact you within 24 hours of receipt of your information. Click the file below to download the PDF worksheet. After you have filled out the form, please email it back to us at [email protected] For more information, please fill out our contact form by clicking here. CONTACT FORM