RMS Study Guide 2026
Everything you need to pass the RMS exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
RMS exam key facts
- The NRPP RMS exam has 165 questions: 150 scored questions worth 1 point each and 15 unscored questions worth 0 points. Source
- The NRPP Radon Mitigation Specialist exam has a 3-hour time limit. Source
- The NRPP Radon Mitigation Specialist (RMS) exam costs $175, and exam fees are non-refundable. Source
- NRPP requires a 30-day wait between exam attempts, with no more than four attempts in a 12-month period. Source
- An NRPP exam result is good for up to one year when applying for NRPP certification. Source
📋 RMS Exam Format at a Glance
📚 RMS Topics to Study (28)
✍️ Sample RMS Questions & Answers
1. For a commercial building with a crawl space and conditioned slab areas, what combined mitigation approach is typically used?
Combined buildings require sub-membrane depressurization in the crawl space and sub-slab depressurization under slab areas for complete radon control.
2. What does a failing post-mitigation test indicate?
A post-mitigation test showing radon at or above 4 pCi/L indicates the system needs optimization: additional suction points, better sealing, or a more powerful fan.
3. Why is it necessary to measure airflow when installing a radon mitigation system?
Measuring airflow during the installation of a radon mitigation system is crucial for verifying its proper operation and effectiveness. It allows the specialist to confirm that the fan is creating adequate suction and that radon is being effectively drawn from beneath the slab. This measurement helps optimize the system's performance and ensures it meets reduction targets.
4. In a commercial basement with a sump pump, what special consideration applies during SSD installation?
Sump pits can be effective suction points, but the pit must be sealed with an airtight cover penetrated only by the suction pipe to prevent radon from bypassing the system.
5. What is the minimum number of post-mitigation radon tests required before issuing a compliance certificate under most state programs?
Most programs require at least one post-mitigation test to verify the system has reduced radon below the action level.
6. What type of fan is most appropriate for a large commercial Sub-Slab Depressurization (SSD) system requiring high airflow at moderate static pressure?
Centrifugal blower fans are preferred for large commercial SSD systems because they deliver high airflow at the moderate static pressures typical in those applications.
🎯 Free RMS Practice Tests
📖 RMS Guides & Articles
What Practice Test Geeks adds beyond an AI chat for RMS
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length RMS mock exam — 165 questions in 180 minutes with a 70% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed RMS question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable RMS cheat sheet you can print or save as a PDF.
- RMS flashcards built from the same question bank.
- Free RMS practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- nrpp.info — Eligibility, score validity, retake policy, fees, registration deadline, time limit, test delivery, exam format · verified Oct 2026