The Company has adopted the new revenue recognition guidelines in accordance with ASC 606, Revenue from Contracts with Customers (ASC 606), commencing from the period under this report. The Company analyzes its contracts to assess that they are within the scope and in accordance with ASC 606. In determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under each of its agreements, whether for goods and services or licensing, the Company performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations based on estimated selling prices; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation. The Company acts as a principal in its revenue transactions as the Company is the primary obligor in the transactions. Generally, the Company recognizes revenue for its products upon shipment to customers, provided no significant obligations remain and collection is probable. In certain instances, the Companys ConsERV system product may carry a limited warranty of up to two years for all parts contained therein with the exception of the energy recovery ventilator core produced and sold by the Company. The distributor of the ConsERV system may carry a limited warranty of up to ten years. The limited warranty includes replacement of defective parts for the ConsERV system and includes workmanship and material failure for the ConsERV core. The Company recorded an accrual of $91,531 for future warranty expenses at March 31, 2019 and December 31, 2018, which is included in accrued expenses, other. Royalty revenue is recognized as earned. The Company recognized royalty revenue of $0 for the three months ended March 31, 2019 and 2018, respectively. Revenue derived from the sale of licenses is deferred and recognized as license fee revenue on a straight-line basis over the life of the license, or until the license arrangement is terminated. The Company recognized license fee revenue of $12,500 and $12,500 for the three months ended March 31, 2019 and 2018, respectively. The Company accounts for revenue arrangements with multiple elements under the provisions of the Financial Accounting Standards Boards (FASB) Accounting Standards Codification (ASC) Topic 605-25, Revenue Recognition-Multiple-Element Arrangements. In order to account for these agreements, the Company must identify the deliverables included within the agreement and evaluate which deliverables represent separate units of accounting based on if certain criteria are met, including whether the delivered element has stand-alone value to the licensee. The consideration received is allocated among the separate units of accounting, and the applicable revenue recognition criteria are applied to each of the separate units. In December 2017, the Company and Zhejiang MENRED Environmental Tech Co, Ltd., Zhejiang Province, China (Menred), entered into a License and Supply Agreement (the Agreement), effective December 21, 2017. Pursuant to the Agreement, the Company licensed certain intellectual property and improvements to Menred, for use in the manufacture and sale of energy recovery ventilators (ERV) and certain other HVAC systems for installation in commercial, residential or industrial buildings in China. Menred also agreed to purchase its requirements of certain products from the Company for Menreds use, pursuant to the terms and conditions of the Agreement. Menred will also pay royalties, as defined, to the Company on a quarterly basis, based on price and production volume as provided by Menred. No royalties are due within the first year of the Agreement. Also pursuant to the Agreement, the Company is required to purchase 50,000 square meters of Product from Menred for delivery as an annual minimum with a 10,000 square meter minimum order quantity per delivery. The Agreement has a ten-year term with mutually agreed upon five-year extensions. Shipping and handling fees billed to customers are included in revenue. Shipping and handling fees associated with freight are generally included in cost of revenue.