# Buyer FAQ Center — Coverage, MOQ, Samples, OEM & Certification | SAINTDELAND > Answer-first buyer questions on model selection by coverage in m³, control options, OEM / ODM MOQ, samples, lead times, certification scope, factory and RFQ. [Skip to content](#main) [WhatsApp: +86 18594004460](https://wa.me/8618594004460?text=Hello%2C%20I'm%20interested%20in%20SAINTDELAND%20commercial%20scent%20diffusion%20equipment.%20Please%20send%20me%20product%20and%20quotation%20details.) [Email](mailto:vivi@saintdeland.com) English [![](https://fsu.creght.com/site/2116085547108667392/1793349243305__saintdeland_logo.jpg?w=3072&fmt=webp)SAINTDELAND](/) [Products](/products.md) [Solutions](/solutions.md) [OEM / ODM](/oem-odm.md) [Manufacturing](/manufacturing.md) [Quality](/quality-certifications.md) [Applications](/applications.md) [Resources](/resources.md) [About us](/about-us.md) [Contact](/contact.md) English [Request a Quote](/contact.md) 1. [Home](/) 2. / [Resources](/resources.md) 3. /FAQ Buyer FAQ Center # Buyer questions. Direct answers first. Selection, coverage, control, OEM / ODM, MOQ, samples, lead times, certification, factory and RFQ — the questions to resolve before ordering, each answered directly with details, evidence and next steps. AllProduct SelectionCoverageControlOEM / ODMMOQSamplesLead TimeCertificationFactoryQualityRFQ 18questions Product SelectionHow do I choose the right SAINTDELAND model for my space? Start with the space volume in cubic meters (m³), not floor area: match it to the stated coverage of the model, then confirm oil capacity, control mode and enclosure dimensions for your placement plan. ### Details CoverageThe core range states 200 m³ up to 10000 m³. Layout, ventilation and ceiling height influence suitability. Oil capacityReservoirs range from 130 ml to 1000 ml × 2, depending on the model. ControlSDL312 and SDL313 list Bluetooth; the other six models list Bluetooth / WiFi / Button. ### Evidence All coverage figures come from the confirmed core specification sheet (see Documents & Downloads). ### Related [Browse products by coverage](/products.md#choose-by-coverage) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [GET PRODUCT RECOMMENDATION](/products.md#choose-by-coverage) CoverageWhich model is suitable for 200–500 m³? SDL312 and SDL313. Both state 200–500 m³ coverage with a 130 ml oil capacity and Bluetooth control. ### Details SDL312200–500 m³ · 130 ml · Bluetooth · white / black housing. SDL313200–500 m³ · 130 ml · Bluetooth · white housing. Selection noteCompare the color options and confirm layout and ventilation; stated coverage is a specification, not a site guarantee. ### Evidence Coverage values follow the confirmed core specification sheet and are always expressed in m³. ### Related [SDL312](/products/sdl312.md) [SDL313](/products/sdl313.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [VIEW SDL312 / SDL313](/products.md) CoverageWhich model is suitable for 500 m³? SDL611. It states 500 m³ coverage with a 300 ml oil capacity and Bluetooth / WiFi / Button control. ### Details SDL611500 m³ · 300 ml · Bluetooth / WiFi / Button · 170 × 80 × 210 mm. Selection noteCompare the enclosure dimensions with the available placement and refill access before ordering. ### Evidence Coverage and dimensions follow the confirmed core specification sheet. ### Related [SDL611](/products/sdl611.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [VIEW SDL611](/products/sdl611.md) CoverageWhich model is suitable for 1500 m³? SDL614. It states 1500 m³ coverage with a 300 ml waterless reservoir and Bluetooth / WiFi / Button control. ### Details SDL6141500 m³ · 300 ml · Bluetooth / WiFi / Button · black housing · 220 × 140 × 220 mm. Selection noteReview maintenance access alongside the coverage figure when planning hotel reception, office or showroom zones. ### Evidence Coverage values follow the confirmed core specification sheet. ### Related [SDL614](/products/sdl614.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [VIEW SDL614](/products/sdl614.md) CoverageWhich model is suitable for 2500 m³? SDL613. It states 2500 m³ coverage with a 1000 ml oil capacity and Bluetooth / WiFi / Button control. ### Details SDL6132500 m³ · 1000 ml · Bluetooth / WiFi / Button · 220 × 100 × 305 mm. Selection noteFor shared hotel or showroom areas, review zoning and airflow rather than assigning one device to the whole space by total volume alone. ### Evidence Coverage values follow the confirmed core specification sheet. ### Related [SDL613](/products/sdl613.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [VIEW SDL613](/products/sdl613.md) CoverageWhich models cover 4500 m³? SDL616 and SDL821. Both state 4500 m³ coverage with a 1000 ml oil capacity and Bluetooth / WiFi / Button control. ### Details SDL6164500 m³ · 1000 ml · 220 × 140 × 340 mm · iron chassis. SDL8214500 m³ · 1000 ml · 125 × 100 × 160 mm · aluminum atomizing head. Selection noteCompare dimensions, chassis and atomizing-head material with your installation drawings and service clearances. ### Evidence Coverage values follow the confirmed core specification sheet. ### Related [SDL616](/products/sdl616.md) [SDL821](/products/sdl821.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [COMPARE SDL616 / SDL821](/resources/product-comparison.md) CoverageWhich model covers up to 10000 m³? SDL820. It states 10000 m³ coverage — the highest in the core range — with 1000 ml × 2 oil capacity and Bluetooth / WiFi / Button control. ### Details SDL82010000 m³ · 1000 ml × 2 · 26W · Bluetooth / WiFi / Button. Selection noteFor HVAC / central scent diffusion projects, obtain installation and compatibility confirmation before ordering; do not assume a direct duct connection. ### Evidence Coverage values follow the confirmed core specification sheet. ### Related [SDL820](/products/sdl820.md) [HVAC solution brief](/solutions/hvac-central-scent-diffusion.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [VIEW SDL820](/products/sdl820.md) ControlWhich control options are available? SDL312 and SDL313 list Bluetooth only. SDL611, SDL613, SDL614, SDL616, SDL820 and SDL821 list Bluetooth / WiFi / Button. ### Details Bluetooth onlySDL312, SDL313. Bluetooth / WiFi / ButtonSDL611, SDL613, SDL614, SDL616, SDL820, SDL821. ConfirmationA listed control mode does not by itself establish remote-cloud operation, network compatibility or app features — confirm the ordered configuration and operating instructions. ### Evidence Control specifications follow the confirmed core specification sheet and are repeated on every product page. ### Related [Bluetooth vs WiFi guide](/resources/bluetooth-vs-wifi-scent-diffuser.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [COMPARE CONTROLS](/resources/product-comparison.md) OEM / ODMDo you support OEM / ODM? Yes. SAINTDELAND supports OEM / ODM and private-label projects covering logo / branding, color, packaging and product development — feasibility and final specifications are confirmed per project. ### Details BriefShare the selected model, destination market, quantity, logo artwork, color reference and packaging artwork. SampleAn approved sample (appearance, labeling, controls, packaging) precedes bulk production. ScopeFunctional changes and private label require feasibility review; no completed client project is implied. ### Evidence See the OEM / ODM workflow page for the eight-step process from selection to after-sales. ### Related [OEM / ODM](/oem-odm.md) [OEM buyer guide](/resources/oem-scent-diffuser-buyer-guide.md) [Request a Quote](/contact.md) [START OEM PROJECT](/contact.md?interest=oem) MOQWhat is the typical OEM MOQ? OEM / ODM is typically 500–1000 units. Neutral wholesale is typically 50–100 units, and ready-to-ship orders start from 1 unit. ### Details Ready to shipFrom 1 unit, subject to stock. Neutral wholesaleTypically 50–100 units. OEM / ODMTypically 500–1000 units. NoteThese are general commercial policies, not model-specific guarantees — confirm final terms in your quotation. ### Evidence Commercial policies are stated on the OEM / ODM page and in the buyer guides. ### Related [OEM / ODM](/oem-odm.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [REQUEST OEM QUOTATION](/contact.md?interest=oem) SamplesCan I order a sample? Yes. Standard samples take 3–5 business days; custom-logo samples take around 30 days. Sample cost and the agreed configuration are confirmed in your quotation. ### Details Standard sample3–5 business days, subject to stock and configuration. Custom-logo sampleAround 30 days, including artwork approval. ApprovalConfirm appearance, labeling, controls and packaging in writing before bulk production. ### Evidence Sample lead times are general commercial policies confirmed per order. ### Related [Commercial policies](/oem-odm.md) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [REQUEST A SAMPLE](/contact.md) Lead TimeHow long does production take? Standard mass production typically takes 15–25 days; customized production typically takes 30–45 days after sample approval and configuration confirmation. ### Details Standard productionTypically 15–25 days. Customized productionTypically 30–45 days. NoteSchedules depend on the agreed order, configuration and approvals; confirm the final timeline in your quotation. ### Evidence Production lead times are general commercial policies stated on the OEM / ODM page. ### Related [Manufacturing](/manufacturing.md) [OEM / ODM](/oem-odm.md) [Request a Quote](/contact.md) [PLAN YOUR ORDER](/contact.md) CertificationWhat compliance documents are available? Original supplied documents are available for CE EMC, FCC Part 15 Subpart B, RoHS, an FCC radio grant (FCC ID 2BCCLRAD-8) and an FCC radio test report — each with its own listed models, tested sample and conditions. ### Details CE EMCEMC Directive 2014/30/EU; EN IEC 55014-1:2021 and EN IEC 55014-2:2021. Reference LH-230903022799. FCC Part 15 Subpart BSupplier's Declaration of Conformity, reference LH-230903022800. RoHSDirective 2011/65/EU and (EU) 2015/863; reference LH-230903022801. FCC radio grant / test reportFCC ID 2BCCLRAD-8; test report STS2512131W01 (Part 15.247). ### Evidence The eight core SDL models are listed in the CE EMC, FCC Part 15B and RoHS documents. Scope is limited to the models, tested samples and configurations each document identifies — availability does not imply blanket certification. ### Related [Quality & Certifications](/quality-certifications.md#documents) [Compliance guide](/resources/commercial-scent-diffuser-compliance-certification-guide.md) [Request a Quote](/contact.md) [VIEW DOCUMENTS](/quality-certifications.md#documents) FactoryCan I verify the SAINTDELAND factory? Yes — original factory photographs and workshop video are published on the Manufacturing page, and the company and factory use the same Guangzhou address. You can contact the team to arrange a factory review. ### Details Evidence publishedUnfiltered workshop photographs and real production-line / assembly video footage. IdentityShengdelan Fragrance Technology (Guangzhou) Co., Ltd., Baiyun District, Guangzhou — company and factory at one address. No unverified claimsNo factory-size, staffing or capacity figures are claimed without verified records. ### Evidence See Manufacturing for the photo gallery and the production-line video. ### Related [Manufacturing](/manufacturing.md) [How to verify a manufacturer](/resources/how-to-verify-a-scent-diffuser-manufacturer.md) [Request a Quote](/contact.md) [REVIEW FACTORY EVIDENCE](/manufacturing.md) QualityHow is quality controlled? Quality requirements are defined per order across incoming material check, assembly inspection, functional testing, final inspection and packaging inspection — with inspection criteria and records agreed for your configuration. ### Details Incoming & assemblyComponent acceptance criteria and configuration checks against the approved specification. Testing & final inspectionAgreed functions, control modes and finish verified against the approved sample and purchasing specification. PackagingProtective packing, artwork, shipping marks and document checks confirmed before shipment. ### Evidence Detailed inspection records are requested per order; no universal performance or inspection-rate claims are made. ### Related [Quality & Certifications](/quality-certifications.md) [Manufacturing](/manufacturing.md) [Request a Quote](/contact.md) [REVIEW QUALITY FRAMEWORK](/quality-certifications.md#quality-control) RFQWhat should an RFQ / inquiry include? Send the model (or your space volume in m³), estimated quantity, destination market, application, control requirement and any OEM / branding / packaging needs — the fuller the brief, the more specific the recommendation. ### Details MinimumName, email or WhatsApp, product / model and your question (Quick Inquiry). Full RFQAdds company, country, estimated quantity, application, space volume and OEM / ODM requirements. ResponseOur team replies by email or WhatsApp with model suggestions and the documents relevant to your order. Pricing is quoted per inquiry. ### Evidence Both the Quick Inquiry and full RFQ forms are available on the Contact page and on every product page. ### Related [Contact / RFQ](/contact.md) [Quick Inquiry](/contact.md#quick-inquiry) [Compare all models](/resources/product-comparison.md) [OPEN RFQ FORM](/contact.md) Product SelectionHow often do I need to refill the aroma oil? There is no fixed refill interval — it depends on your operating schedule and diffusion settings. Plan around the stated reservoir capacity of your model (130 ml up to 1000 ml × 2) and confirm typical runtime settings with the team. ### Details Reservoir capacitySDL312 / SDL313 list 130 ml; SDL611 / SDL614 list 300 ml; SDL613 / SDL616 / SDL821 list 1000 ml; SDL820 lists 1000 ml × 2. What changes the intervalOperating hours, diffusion intensity settings, airflow and the number of zones served. Planning noteReview refill and maintenance access together with the placement plan before ordering. ### Evidence Reservoir values follow the confirmed core specification sheet; no refill-rate figures are claimed without verified records. ### Related [Browse products by coverage](/products.md#choose-by-coverage) [Compare all models](/resources/product-comparison.md) [Request a Quote](/contact.md) [ASK ABOUT REFILL PLANNING](/contact.md) Product SelectionHow does SAINTDELAND scent diffusion work? The core range diffuses fragrance oil through an atomizing head paired with a model-specific reservoir; SDL614 is listed as a waterless scent diffuser. Exact diffusion behaviour depends on the model and its settings — confirm the operating instructions for your configuration. ### Details Atomizing headAluminum or plastic, depending on the model (see each product page). ReservoirFrom 130 ml to 1000 ml × 2 across the core range. ControlDiffusion is operated through Bluetooth (SDL312 / SDL313) or Bluetooth / WiFi / Button (the other six models). ### Evidence Descriptions follow the confirmed core specification sheet and published product information; no performance figures are assumed. ### Related [Compare all models](/resources/product-comparison.md) [Bluetooth vs WiFi guide](/resources/bluetooth-vs-wifi-scent-diffuser.md) [Request a Quote](/contact.md) [DISCUSS YOUR APPLICATION](/contact.md) [Browse products](/products.md) [Compare all models](/resources/product-comparison.md) [Buyer resources](/resources.md) [Contact / RFQ](/contact.md) Built around your business ## Still deciding? Tell us about your space. Share your space volume, application and quantity — we reply with model suggestions and the documents relevant to your order. [Request a Quote](/contact.md) [SAINTDELAND](/) Scent diffusion for commercial spaces. 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